"Just learn Thai lol" is not actionable advice either. I say this as someone who has literally done what you suggest in 50+ countries. If he could somehow sneak into New Zealand (not Australia!) I'd strongly recommend that instead at the moment. Buy a van. Hike. So many great treks and places that you usually need to reserve months in advance and far higher likelihood of meaningful interactions.
Heading there next month ;)
They decided last week that on the first and fifth days from arrival you must stay in an approved hotel. They don't tell you the results until you are all tucked in, and so you have a rather high chance of ending up in an expensive covid jail.
Next month is a long time away and they are making up new rules as they go as per usual. I admire your optimism and hope you get lucky and enjoy the place as few people will get to experience the islands so empty :)
Thailand is not an expensive place ;)
Travel can be great, but travel is at best a sort of emotional palliative care for a person in the OPs situation as I understand it.