Never had any intention of living , I actually intended to go back much sooner but lost 4 front teeth and stayed to complete dental implants ... They take best part of a bloody year.
I would get a proper visa talking from personal painful ongoing experience . I was doing what you suggest for couple years. Then I tried to fly to Phnom phen stay few days go back to Bangkok ... I was denied entry detained until I sourced the funds back to Phnom phen . I know plenty who got away with it much longer than me but it's random , go to a desk where someone's having a bad day and theirs every chance you'll get rejected after to many tourist visa .. Maybe look at an Ed visa . Others will answer soon with more suggestions .. Cheers 👍