I homebrew too much stuff that never sees light at the table.
I enjoy rules lite to rules medium at most, erring toward the lighter side. Games with tons of character options that lead to mechanical widgets I have to know as the GM are problematic. 3e/Pathfinder is way too complex. 5e started out just right but as soon as the first splats hit with feats and more subclasses I couldn't get on board anymore. My players love options, though, so it's a constant struggle on both sides to get what we want out of the game.
I never used to have anything close to "stagefright" for nearly 30 years. Now I can barely get a game scheduled, and running anything past 4-5 sessions is a nightmare. I'll blame the pandemic, but I probably just need some time off from gaming altogether for a bit. The problem with this (besides the obvious) is that I often don't say "No" when I should to game sessions.