OP, seems you have already done 2 visa exempt entry via air.
Suggest you do a border bounce for visa exempt entry.
That can be extended by 30 days.
You could do another if required.
Where are you located in Thailand?
Alternatively you could fly out and obtain tourist visa and return no issue.
My favourite joint is Saigon.
Be aware that consulate requires appointment so forward planning required..
Vientiane also requires appointment.