Yet another one roster advice needed

elvy75

Need advice in which direction to develop my roster. Playing for about a month now and here is what i have so far:

CStorm lvl 78 3/5/5 also have green cover that expires in 7 days, so i wonder should i swap it for some of other ones
Thor lvl 53 4/2/3
IM35 lvl 50 3/5/5
MStorm lvl 50 5/5/3
Wolverine lvl 43 1/3/5
MBW lvl 40 5/5
Daken lvl 37 4/2
MN Magneto 29 2/2/2
GSBW 28 1/0/2
Daredevil lvl 25, 2 red
Punisher lvl 24, 2 green
Capetan America lvl 24 1/3/4 stopped leveling as i wonder if i should put my iso into him at all
MHawkeye lvl 16 2/1/1
Dr Doom lvl 15, 1 Blue
Wolverine Patch, lvl 15, 1 yellow
OBW lvl 9, 1/1/1 had no luck with her covers at all

Covers that i have are:
Invisible woman - yellow - expires in nearly 3 days
Spiderman - blue - expires in nearly 5 days
Hulk - Black - expires in nearly 7 days

With this thanks to scaling i am able to rank into top 20 of most pve and pvp, but i feel it is time to slowly switch to something else. Since i am not really willing yet to start paying i would appreciate if i could have some bit of advice on how to progress from now on. The most logical would be to sell MBW as i dont really use her any longer and maybe MHawkeye as i really don't know how to play with him, I don't want to sell any 3*** as i will obviously need them in near future, either for pve or for switch to 3*** roster. I find that MStorm and IM35 can still be a bit useful, but question is for how much longer. I would appreciate all advice.