Should one go back to their ex company?

I used to work for this company (let's call it ex-company), it was kinda my first job out of college. I wasn't super early, but considering the size of the team now, I was one of the earliest employees.

I left the company after working there for around a year as I wanted a different role and a work life balance. I've been working in this new company for 1 year now and in hindsight, it was a bad career move.

The ex company is now hiring for a role I'm interested in but I'm not sure if I should apply. Or if I would even be able to crack their interview now. 😅

Should I apply? Is it common to go back to a company you left before?