What are my options for extending my stay in Thailand after STV visa and COVID extensions end?

Ed visa 11 months. baht to the school. Need to stay 1 month in Bangkok to sort out paperwork then you can do lessons online and go back to Bangkok immigration every 3 months for extension. AAAthai school check it out. Been there yesterday

If you can't risk being denied entry then you need to find a better visa than a tourist visa. You can buy an elite visa, it sounds like the only suitable one for you, as I assume not married, not working, etc

Before covid I was doing back-to-back tourist visas. Never once did I get denied entry. It is a risk and I always had a plan B. This is post covid times so who knows.

I am 47.5 I too am waiting for retirement visa.

Once I got stopped by an immigration officer. They asked me some questions, yelled at me for a few minutes then sent me on my way. The whole time I was very polite, very respectful "yes sir, no sir". I can easily see how a person might get an attitude with the IMO, which would lead to being denied entry. - Don't get an attitude.

The IMO told me that if I am going to do visa runs I should spend a couple of weeks outside of the Thailand each run, so I was doing that. Australia offers MTV's to Americans probably everybody else too (Pre Covid),

That's my advice and what has worked for me.

A) Travel by land when possible (better plan b options)

B) Stay outside of Thailand 2 or 3 weeks each run

C) If/When the IMO supervisor yells at you, remain friendly, respectful, let them know you know you are guest and you love their country.