To look at the long picture and stop only pescimism, and even if this season isn't officially over (I guess at the very best we beat Charlotte and win 2 games in the BKN series, it would already be a quiet postitiv ending), I think we can begin to project on next year.
So name by name, actor by actor, who need to stay to build the future, who should go ? Personnally I would try medium adjustments.
PLAYERS
IN 7 core players and 4 Gleaguers = 11 players
Tatum, Brown, Timelord (wait next year for the extension), Smart (if OK to sign extension at 12-14M a year, if not sign Fournier), Nesmith, PP, Parker
for 11 spot and + and for Gleague : GW, Langford, Edwards, Taco
OUT TRY TO TRADE 2 trades (low or negative value) + 1 ST
Kemba + Thompson. Try to find a pure def big or old style and a PF like Collins ST/Barnes/Markanen in a multiple trade. Give multiple picks including this one if necessary (like if for Grant or even Collins)
Sign and trade Fournier for TPE and bring Ball by exemple for pick(s) ST (or trade Smart+ pick and keep Fournier)
OUT FA4 to 6 players
Ojeleye, Waters, Kornet, Fournier
Stash Madar one more year in an elite euroleague team if possible
STAFF
In both Ainge and Stevens... But last chance this summer for Danny and next year for CBS.
Don't know about the coaching staff. Maybe some news stuff in medical/kiné/ sophrology ... approach or staff... I don't know.
Ball-Brown-Tatum-Collins-Timelord-Smart-Nesmith-PP-Vet old school big (Valanciunas/Poeltl/Drummond...?)- Parker + Gleaguers/ vet min (Theis?)... A good fantasy young team with all titulary from 23 to 26 and Smart/Valanciunas by exemple as big brothers...