Just sorting a visa out help with bank statements do Thailand accept Monzo as a Uk bank

Hi , I'm sure this has came up time and time again, I'm from the uk and currently on 6 month multi visa ( after extensions wd end April) , I'll be 50 in December and want "o" visa/retirement visa what are my best options to do this? I have money in uk but xchange rate is terrible so reluctant to transfer the 800,00 into my Thai bank unless it was worthwhile. Any advice would be appreciated