Looks like I am beginning my freelance journey.
Usefull Issue Tracker / Project Management tool?

If it's foss and written in python that would be great, I would probably try to extend it with extensions later on.

Maybe use a free one, why would you be spending time coding a ticket solution when you could be solving problems and getting paid in that time?

Clickup is one of the best free services I have used in ages. I ran a whole development team from there for free.

Wasting time as a freelancer means losing money.

@Drmzindec I said I am looking for FOSS solution ;) so I can run it locally without need to pay much.

@GTom You can run Clickup locally or in browser, its up to you.