Parsha Korach - The Levites and Kohanim

It seems like the person that speaks the least and does the most for the Israelites, is Aaron. Yet, Aaron and his children are threatened if they are not careful in Chapter 18 if a non-Levite enters the sanctuary, or a non-Kohen performs services of the kohen. I find it interesting how before Chapter 18, G-d talks to Moses and Aaron, why here does G-d have to speak to Aaron through Moses (v. 1). Now, when looking at the Hebrew and the Stone Edition, it shows that Adonai spoke to Aaron, no where does it show Moses.

Does G-d think that Aaron won't listen to him if spoken to directly? Does G-d think that Aaron will rebel if this threat isn't given to him through Moses as Korach rebelled thinking that it was sufficient to be a leader after only hearing G-d's voice once at Mount Sinai? After looking through dozens of documents that solely focus on Korach, I guess rightly so since the book is named after him. Surprisingly in as you can see in 16:33 it says "their names were thus blotted out from among the assembly."

Now as I was saying, I looked at dozens of articles and couldn't find anything that focused on chapter 18 so I figured I would just do a d'var.
How important is leadership or knowing your place and/or role in life?
Aaron up unto this point has only been told what to do, even when he stood between the living and the dead. He was told what to do by Moses.
In chapter 18, it seems as though Aaron needs to be told exactly what will happen to him and his sons if they let others go where they're not supposed to go and do things they're not supposed to do. Have we ever faced with serious repercussions when we allow others to do our job and we don't if they know the rules and regs of the job?

Some of the questions I have and really can't find the answers to, I hope you will help me find them are: How to be careful to not let those who are not Levites or Kohanim get too close so that no more people die? Why does Aaron need to hear this threat?

I think it's important to know your purpose in life even though many of us don't get the chance to know what our purpose in life is and what we are meant to do in order to fulfill our destiny.

The Kohen and the Levites had the blessing of really being told what they were to do and what would happen if they allowed others to do it or go there. I sometimes wish G-d would give me a clear sign as to what my purpose, my role in this life is so that I can do it.
I find it interesting that G-d tells them that this is a gift in doing G-d's work and not for personal work. To me, this means, don't abuse your power. Did G-d think that there would be abuse of power or is the perception that Korach and the Children of Israel perceived the "abuse of power" sufficient to clarify this here?

I believe that G-d wants us to prevent further deaths and to allow us to acknowledge that our role in life isn't always to be the President, Vice President, or part of the C-Suite but that every role in life is important and a gift. I also see how we are to support each other within our community. Not everyone has the luxury or benefit of having it all so we have to take care of each other. When we do though, we are to give the best to those in need.

This Parsha also speaks about how important it is to make amends for the things done wrong in the past, i.e. giving 5 shekels for the redemption of the first-born is thought to amend for the sale of Yosef into slavery for 20 pieces. Per "https://www.etzion.org.il/en/halakha/studies-halakha/philosophy-halakha/pidyon-ha-ben-and-commandment-chinukh"
The Torah commands us to redeem the firstborn son in each family, by giving five shekels (coins of particular mass) of silver to the Kohen (priest) when the child is a month old (Bamidbar 18:15-16.) This is in commemoration of the plague of the firstborn, when God redeemed the Jewish first born sons as He smote the Egyptians (Shemot 13:13-15.) Children of male and female Kohanim and Levi'im (Levites) are exempt from this mitzva.

I feel that since there was human sacrifice going on, G-d wanted us to be separate by telling us only to sacrifice the firstlings of animals and not the first-born human.

I think the above is such a beautiful covenant between G-d and His people as to me this is not just for the Kohanim but for everyone. His covenant will endure like salt, never decaying, forever enduring throughout the ages. It's as if to say, no matter what you do, I will always love you and take care of you. I will be there for you and your descendants and the descendants of your descendants. This sort of gives me comfort that G-d is with me even when I feel alone.

So even though G-d will protect everyone He feels it's necessary for a separation of roles to be made. Again, going back to my beginning thoughts. We're not all meant to be the President or Vice-President but we will forever be taken care of. We may go through struggles and be tired of those struggles as I have often felt for the last two years but I know that by continuing to learn Torah and reading it with a different lens every year, I grow and only wish the same for each person.

I think the above is specified so no one ever feels they are better than the person next to them, everyone needs to give the best of what they are given to the Eternal. So my goal and my challenge to you is to find a way to be the best you can be, try to find out what your role is in life, and if you can - take care of those who are in need in your community.