Improv requires your audience to be informed about what improv is. With stand-up, anybody can sit down and watch stand-up and laugh at jokes.
Probably all of my advice is bad advice.
I grew up very Catholic. I wanted to be a priest.
I'm just going to keep doing comedy because I don't know what else to do. I have no other applicable skills.
If you're waiting for inspiration, you'll wait until you're dead.
Just start writing and you'll find what you want to say.