@Anastasiia *****
, it depends .. are you actually on a visa?
Like a 60day Tourist Visa, and you arrived after last November 2020?
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Or you like to extend a year on your Non O-B-ED visa?
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Or you like to receive another 60 day Covid extension?
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This matters since for starters you have to go a different place in Bangkok .. and as people said you have to be at least registered in BKK also.
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For certain visa types to extend you even have to show a rental contract and a lot of paperwork.
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So with more details we might be able to answer your question.