What should I do to make my team better?

My team in 12 team Half PPR
RBs - Hunt, DJ, Thompson
WRs - K Allen, Diggs, Edelman, Davis
TE - Brate, Olsen

What can I do to improve my team? Sell DJ for possibly Kamara if the owner is panicking? Or stand pat?

In no world would Kamara’s owner be panicked enough for that trade. Maybe, MAYBE, DJ and Diggs but it depends on his receivers.