So at the current 20-man roster...
2024-25 Nashville Predators
Forsberg ($8.5M) - O'Reilly ($4.5M) - Nyquist ($3.185M)
Stamkos ($8M) - Novak ($3.5M) - Marchessault ($5.5M)
xxx - Sissons ($2.857M) - Evangelista ($0.7975M)
Jankowski ($0.800M) - McCarron ($0.900M) - Smith ($1M)
yyy
Skjei ($7M) - Josi ($9.059M)
Lauzon ($2M) - Carrier ($3.75M)
Stastney ($0.825M) - Fabbro ($2.5M)
zzz - Schenn ($2.75M)
Saros ($5M)
Wedgewood ($1.5M)
Ekholm retention: $0.250M
Johansen retention: $4M
Turris Buyout: $2M
Duchene Buyout: $5.5556M
TOTAL: $85.7291M
2024-25 NHL Cap: $88M
REMAINING CAP SPACE: $2.2709M
... it's a hair under being able to go to a 23-man roster with 3 additional players at $775k (e.g. Parssinen, Tomasino, Del Gaizo), but Stastney is waiver exempt in that mix, so it's doable to keep those 3 on the big roster if you send him down.
Personally, I would not be going the route of signing any leftover veteran UFAs, but there are a few guys out there who might take a league minimum deal for 1-year just to stay in the league. If you signed Tyler Johnson and Justin Schultz for $775k each, assuming the team is firing Tomasino into the Sun regardless, then you could ice:
2024-25 Nashville Predators
Forsberg ($8.5M) - O'Reilly ($4.5M) - Nyquist ($3.185M)
Stamkos ($8M) - Novak ($3.5M) - Marchessault ($5.5M)
Johnson (UFA - $775k) - Sissons ($2.857M) - Evangelista ($0.7975M)
Jankowski ($0.800M) - McCarron ($0.900M) - Smith ($1M)
Parssinen (RFA - $0.775k)
Josi ($9.059M) - Fabbro ($2.5M)
Skjei ($7M) - Carrier ($3.75M)
Lauzon ($2M) - Schultz (UFA - $0.775k)
Schenn ($2.75M)
Saros ($5M)
Wedgewood ($1.5M)
Ekholm retention: $0.250M
Johansen retention: $4M
Turris Buyout: $2M
Duchene Buyout: $5.5556M
TOTAL: $87.2291M
2024-25 NHL Cap: $88M
REMAINING CAP SPACE: $0.7709M