Ways of expressing appreciation

Good morning friends,

I have a team of assistants helping me in Athens and I often want to express appreciation to them, but the only word I seem to come up with is ευγνωμοσυνη. I am wondering if you can recommend some other words, expressions etc that I could use? There must be more!!

Thank you.

You mean other than ευχαριστώ;
You could say σας είμαι ευγνώμων.
Το εκτιμώ ιδιαίτερα = I really appreciate that π.χ. εκτιμώ (ιδιαίτερα) τη βοήθειά σας.
Or more με σώσατε/ με σώζετε! you saved me
Δεν έχω λόγια... Words are not enough...

These are very helpful SBE. Thank you.