To express gratitude for someone's hard work in Engpsh, you can say:

"Thank you for all your hard work."
"I really appreciate all the effort you've put in."
"Your hard work has not gone unnoticed."
"You deserve recognition for the hard work you've done."

Alternatively, you could also say:

"Thanks for going above and beyond."
"I'm grateful for everything you do."
"Your dedication and hard work are much appreciated."
"I couldn't have done it without your hard work and support."