Sure, but that's why I said "for a fact". Black Panther was never really an Avenger (yes, I know Cap essentially deputised everyone present in *that scene*, but still!) Plus, he's a King, with an army and probably has lots of other things to do.
Same deal with Scott and Hope; the latter of which was a wanted felon last we hear, and while a pardon is almost a certainly at this point...we don't know for a fact.
We don't quite know what the deal is yet with Sam & Bucky until their show comes on. I mean probably? Sure! Definitely? Well the rumour is that the show with focus on the US Government trying to frustrate Sam from taking on Cap's mantle, and how far they go with that we'll have to wait and see. Plus like Hope, Bucky is also a Schrodingers Fellon fort he time being, so for all we know they could both be on the lamb.
Basically what I was getting at that FFH certainly gave the impression that nobody other than Beck and Peter were available to deal with a potentially world ending event. So odds are, all the ones left on Earth are out of contact for one reason or another and as such, probably not active Avengers in the strictest sense.
Quite possibly. But also quite possibly she's no longer active. Indeed, given the implications of her upcoming show and subsequent role in Strange 2, it's seems more likely that post Endgame she's in not fit state to be "Avenging".
I also specified "on Earth".