HELP! How to improve my dynasty team?!

QB: Tom Brady
RB: Ezekial Elliott, Saquon Barkley, Dalvin Cook, Derrick Henry, Phillip Lindsay, Kerryon Johnson, Jerrick McKinnon
WR: AJ Green, Stefon Diggs, Will Fuller, Amari Cooper, Cooper Kupp
TE: David Njoku
D/ST: Jax
K: Robbie Gould

It’s a 9 person keeper league and you can only keep up to 4 of one position … any thoughts on how to improve my weak spots? A lot of my guys are on late bye weeks, but I’d like to open up a roster spot or two for fill-in QB, D/ST and K …any maybe upgrade at TE?

Thanks in advance!