Despite the multitude of issues with the second Vermintide game, you guys have done a good job at continuing to fix it and support it. At heart, it is really an amazing game and I feel confident it will be even more amazing down the line once it is optimized and new content is added. The combat in this game (melee combat especially) is like none other. It has really ruined all other games for me because none stand up to it.
Finally, I wanted to suggest a few things you could add down the road.
You could add:
-New item traits (revamp the old ones too)
-New enemies (daemons of chaos, beastmen, etc.)
-New career classes
-Level 30 talents for all characters
-New maps of course
-Quests/contracts board (for guaranteed items like reds)