[Question] What’s the best way for me to improve my English pronounciation?

I’m a native German speaker and learned a good portion of my English not in school but by reading English content.

As part of a New Years event we did a Doom Circle and one essential feedback I got was that I have to improve my English accent.

When it comes to my budget I’m willing to invest a few hundred Euro but not thousands.

What would you recommend to me to improve my English pronounciation?