> I feel like I've hit my zenith already and it's just a slow decline from here on out. I’ve been dreading this day because it’s a sad reminder of that.
Sounds like you need to take some serious time to consider who you are. Not the person who accomplished these things in life, but the reason you were given a body and put on this planet to do something.
I had a similar moment after I read "Man's search for meaning" by Frankl. That led me down a 5 year journey to better understand what life is all about. I explored many philosophies, practices, and texts to get closer to an answer. I found my "Ikigai" along the way as well through writing.
Nobody knows what they're doing in life, but I do believe I have a much better understanding of what I'm doing in life because I put the time in to better figure out who I am.