Do I need to upgrade my team for the future/play-offs?

12-team, Full PPR league. I am sitting at 5-3 and tied for 3rd place. I want to start getting ready for the future / play-offs. Any thoughts on who/what I need to do to upgrade my team?

This week:
QB - Lock (streaming this week)
RB - Gibson, Hasty
WR - Adams, C. Davis
Flex - Crowder
TE - Waller
DEF - Steelers

RBs - Sanders, Bernard, Breida, Wilson (IR Spot)
WRs- Chark, Kirk, Jeudy
QB - Wentz

Any thoughts would be greatly helpful!

Ps - I was just offered Scott, Gaskins, Tee Higgins for Chark and Gibson

bump for help