Hi everyone! I'm a little confused as to what visa, if any I can apply for to stay up to 90 days.

I've already been to Thailand this year twice however this time I am coming from Turkey (holiday) and I'd like to stay in Thailand for longer. It seems I need to apply before I enter but I'm not in my home country (Australia).

Sorry if this sounds silly, but the more I read the more confused I seem to have become lol. Is it better just to get an exemption stamp and extend? Or is that only a max of 2 months? Thanks so much in advance!