For you, try advanced beginner or early intermediate material like the comprehensible thai channel, pickup Thai podcast, self-study- thai.com, maybe คำนี้ดี podcast, it teaches English to Thai people, so it is easier to understand.
This can build your vocabulary, improve your reading fluency and listening comprehension, and assume you know how to read; this is a priority. Learn to read properly, too, so you can accurately pronounce the written words (tone rules).
Do a class with a good teacher who will correct your pronunciation, and avoid the "it's ok, I can understand you" thing you need some correction.
Of course, keep using it in day-to-day life, read everything you see in the world around you, ask Thai friends/partner to explain words, etc..
If you want to cram vocabulary like someone suggested, spaced repetition software like Anki is the most efficient, but a bit of a boring slog.