I arrived as a walk-in eight days ago. What do I do and when do I do it to extend for 30 more days and after that can I do one border run come back and stay for another two months from the USA

Traveling to Thailand in August on a US passport. Just gonna use the visa exempt. From what I’ve read it looks like there aren’t any restrictions to entering Thailand anymore. Looks like they’ve dropped the insurance requirements. I read starting June 1st they are charging 300 baht entry fee which includes travelers insurance. Is the 300 baht just part of your airline ticket or do you pay when you arrive? I know you can read a lot of articles about what’s happening in Thailand and they can change the next day so I figured I’d ask on here cause I know a lot of you are experts on this stuff. Thanks