Im Looking for some Team Fortress Server along with capture the flag

Here you go:

Team Fortress
Capture The Flag

Icarus you can see in a simple way the active servers, including the Team Fortress ones, that have people on: https://badplace.eu/

There is also a discord quakeworld Team Fortress Channel, ask in the main quakeworld discord channel for a link for the Team Fortress one, probbaly someone will see it and help you