Tournament Game Analysis

Hi all. I just wanted to post my analysis of a game I played recently to see if anyone has any ideas or suggestions. This is a game from my normally OTB chess club's online championship as we haven't been able to resume OTB chess due to Covid. Here is the game:

The site rating is probably a bit misleading. My opponent is far, far stronger than the 400 point differential would indicate. I believe he is around 2100 FIDE, but he has been inactive for quite some time. I, on the other hand, am unrated, but wouldn't expect to achieve much more than 1500-1600 in standard time controls. So it's a bit of a mismatch. Still, I thought my opening was pretty sound, I had a superior position at a couple of points but I let my initiative slip away and a silly blunder ended up costing me the game. Thoughts?