Being able to say the correct tone is great and all, but ultimately if you want to speak ชัด-ly, it all comes down to rhythm. Reading stuff out loud helps. Having a native speaker correct you is good also. If this isn’t convienent, then just having the original audio for a body of text is fine as well. Start easy. Look for interesting content. Listen to it a lot. If you need help finding interesting content, just ask.
Here are some easy common examples:
ไป ไหน มา common-rising-common
ว่า จะ ใด falling-low-common
ไม่ ว่าง f – f
ไ ม่ ได้ ไป f – f- c
วัน นี้ เหรอ c-high-r
