konceptjones
The one between three and three.
They need to do the opposite of everything that didn't work in phase 4. They 60 years of stories from the source material and the animated series /xmen97 it shouldn't be hard to find the tone. They need to keep th humor to a man nimun and lose the whimsical Disney tone dependijgon the IP they are adapting.
Basically.
Just rewatch Phase 1 and 2; there's your tone. The humor rolls off as a part of normal conversation and usually initiated by Stark 'cause that's just his personality. Ultron, as a creation of Stark's, also had that in him and it comes out periodically in AOU. Stark's gone, but that doesn't mean the MCU needs another person like him. Let a few quips fly here and there but focus on whatever the story is supposed to be and make it a good one.