Where have you been in Thailand before and which did you prefer?
You say you're not into "going out", but what ARE you going to do?
I know I'm asking loads of questions, but it helps us to answer ... a small village in isaan, central Bangkok and samui (for example) are very different and attract different people.
You can be as quarantined as much as you like in any country - you still do quarantine again in Thailand (aside from other considerations, who knows what you picked up in the airport or plane on the way to Bangkok).