How do i say thankyou for everything in greek?

To say "thank you for everything" in Greek, you would say "Ευχαριστώ για όλα" (Efcharistó gia óla). This phrase expresses gratitude for all that someone has done for you. You can also add "πολύ" (polý) to emphasize "thank you very much," making it "Ευχαριστώ πολύ για όλα."