If you take advice in a DM then it is hidden and nobody can correct the advice you get if it is wrong. If that's how you want to be advised on visa issues good luck.
If the Non-OA has not expired (not your entry stamp) and you have new insurance you can do a border bounce to get a new 12 month entry stamp or a stamp up to the expiry of your insurance
You cannot use pension statements as proof of income with a UK passport, you need 800k in a Thai bank account for the first year then subsequently you can transfer to the 65k deposits method