I'd trade Kyren Williams and Cooper Kupp if we could get a third for each of them. I'd also look into trading Jonah Jackson; if he's just sitting on the bench for a guard spot, what's the point?
Rozeboom and Reeder should go. D-Will, possibly Witherspoon, and especially Kendrick could (should in the lattermost) go if we can find an upgrade at corner - which we should. BB3 and Gallimore could go as well, and I wouldn't mind; BB3 is going to get paid, and he doesn't strike me as the type of guy who excels with a second contract.
Noteboom should also go; what's the point of having him if he's just going to be inactive?
I don't know what to do with Higbee. I don't. On one hand, he's saves salary, he's had injury issues, and we have the capability to upgrade him in the draft. On the other, he's our best tight end by far, and Long being an UFA and Parkinson's disappearing act makes him necessary.
Atwell is gone, and thank fate we can close the chapter on his "potential", and that I'll never have to say his name ever again. Robinson's earned himself a huge payday, and Johnson might want to get opportunities as well.
Honestly, I'd say the only two players I'd really want to spend money to keep are A-Jax (even with his unreliability, he's still the best left tackle on the market) and Hoecht (who is actually a solid edge if he's not counted on to be the main guy, which he wasn't this year).