I am wondering how many expressions in English can express "Thank you" (I am just running out of them)
- Thank you (very much) or Thanks.
- Many thanks!
- I appreciate it indeed!
- Thanks a million!
- I can't say enough thanks to you
May I know more?
"I am so grateful." "I am eternally grateful." "You'll never know how grateful I am." "You have my gratitude" "Wow! That really helped!" I'm sure there are many others. I know the last one does not literally give thanks, but I think that it, and other phrases like it, imply(ies) gratitude.
"Much obliged" can be used. An old way of saying thank you.