Preface: this is all top of the head, stream of consciousness stuff and could be way off in relative value, but here goes:
My off-season would include trying to acquire a fairly established goalie on a 2 or 3 year deal, whether that's a UFA like Korpisalo or a trade. I'd move UPL to Seattle for Will Borgen to add toughness to the blueliners. I assume Girgs is going to want to test UFA and am 50/50 on whether or not KO comes back. I'd take him back as a 12th forward and leader at 1m for the year, but that's up to him. I like Jost but am also fine with letting him move on if he wants more than 1.25m for 1 year. He's going to be blocking guys before too long anyway.
I look to move Joker and Olofsson out, possibly as a package deal, for whatever I can get. Ideally I want a Samuelsson clone, but if the Sabres only get picks, then so be it. I look to not draft in the first round, instead flipping the 1st + picks acquired for Joker/VO for a later 1st and a defenseman or a lesser pick and a goalie (Saros?).
I'm also reaching out to Miles Wood in UFA to be a 4th line energy guy to replace one of KO/Girgs, assuming both don't return. JT Compher and Ryan Graves also receive phone calls. Korpisalo as well if there isn't a goalie acquired at the draft.
I think next season, Rousek and Savoie make the team. I don't like rushing a guy from juniors to the NHL but he's so far beyond the WHL it's ridiculous, and he's not Rochester eligible. He also plays like an NHLer in a lot of ways and should be treated as such .
Prospect wise, I try to get Novikov and Huglen inked. The longer this goes on the less likely Johnson signs, so either include him in a trade as a 2nd round pick value equivalent or just take the pick.