What does it mean "try harder Im not worth it"?

You're question seems to be out of context, but let's break it down.

"Try harder." This seems to be a command, encouraging someone to expend more effort.

"I'm not worth it." This seems to be in direct conflict with the previous portion.

Maybe they meant, "Try harder. I'm worth it." They could have added the "not" by mistake.

Suggested course of action: Assume a harmless case of drunk texting and try them again in the morning. Or afternoon. Dealer's choice.