Upgrade from TYGR 300 R , need help please

Hi everyone, I want to upgrade from the TYGR 300 R. Mainly for competitive gaming but also for daily things (youtube, music etc).

What would be a good upgrade with a max budget of 250 euro. Would love to stay at Byerdynamic as there are also good deals right now.

Im eyeing the DT900 PRO X or the DT700 PRO X. Suggestions?

I also have the Fiio E10k Type-C right now. Is this enough or do I need to upgrade this also?

Thanks a lot!