@Sabrina ******
frankly I suggest you consider October or later for your trip to Thailand.
Come on a tourist visa which with extension gives you 90 days in Thailand. At that time look over options to stay longer... Ed visa to study Thai language is a popular choice for up to one year study and stay.
You cannot work on any of the visas unless you have a Thai work permit with correct visa.
The current COVID outbreak is serious and I believe is just the tip of the iceberg ahead in dealing with COVID in Thailand.
Take care.. Stay safe where you are now.