Just started reading your stuff. I have a natural knack for noticing spelling & grammar errors (I literally can’t help it) so my suggestion for you is a great new app called Grammarly. It will truly help you out with your weekly missives.
Aside from punctuation I rarely make mistakes in my writing (just like you I’m not a native English speaker & the punctuation in my native language is significantly different) & Grammarly has helped me notice a pattern of the particular mistakes I make repeatedly so that I can correct them.
It’s extremely well made with a great AI engine behind it & actually lives up to its promise of making one a better writer. Even if they were already a pretty good one to begin with.