The conditions you can come up with for your happiness are a dime a dozen:
“I’ll be happy when this stressful project wraps up.”
“I’ll be happy when I get this new job.”
“I’ll be happy when this problem is resolved.”
Alternatively, you can also resolve to be happy now.
That’s it, that’s the punchline: you know what it’s like to be at your happiest, and you can choose to be that person now…without reason and without condition.