At first glance Tampa Bay appears to be in great shape for 2021 with $28 million in cap space - but that is due in part to having by far the fewest players of any NFL team under contract (30), and the most free agents (29). Here are some of those free agents; combined they represent about $74 million in AAV.
Unrestricted Free Agents - Offense
TE: Gronk
WR: Godwin, AB
RB: Fournette, McCoy, Barner
QB: Griffin, Gabbert
Unrestricted Free Agents - Defense
DL: Suh, McClendon, Nunez-Roches, McLendon
LB: Barrett, David, Minter (ST)
CB: Cochrell, Smith
Unrestricted Free Agents - Special Teams
K Succop, LS Triner, PR Barner
Some additional cap savings might be realized by extending players in the final year of their contract, but that's assuming they won't want to wait one more year for a possibly better offer. Others in their final year could be cut to save cap space, but then you would still have to go out and spend money replacing them.
Final Year of Contract (AAV)
OL Donavan Smith ($14.2 mil)
OL Ryan Jensen ($10 mil)
TE Cameron Brate ($6.5)
TE OJ Howard ($6.0)
DL William Gholston ($5.5)
P Bradley Pinion ($2.8)