Probably restate what others have said here and there.
To me, balancing all lines with speed/skill/size is good. A "rebuild" is completely unnecessary.
Forwards:
Getz is still absolutely a 1C. Hope Eaves comes back well next season, and keep Rakell on his other wing, and there's your balanced 1st line. If Eaves doesn't, not like we can move him unfortunately, so he's an option for 2nd line, and we put someone faster/skilled like Kase or an off-season signing (good luck finding that). Perry shouldn't stay on this line because 2 slow players + 1 moderate speed (Raks) isn't great.
Consider keeping Kesler's line together as more of a traditional 3rd line, with shutdown and PK focus. Hope Kesler comes back stronger and heals up well cuz we're not moving him and we need to utilize him. Silf as possible trade bait, or just keep him because he's still on a reasonable contract. Cogs absolutely stays.
Back to 2nd line...centered around Henrique possibly, or get a 2c (possible signing, or hope someone like Steel might do okay, but that's a lot of pressure and unlikely). Perry showed chemistry with Henrique, so place him here as well. If no Steel, possible option for another skilled AHL to get a shot.
4th line needs to be a line we utilize in a more balanced manner. Needs some skill so we can roll 4 lines, take some wear off of the other 3 lines, and inject some speed/skill. Fine, keep Ritchie here if you want, but if we trade him, hope we get something reasonable in return. With more time for the 4th, Terry and others could slot in reasonably and not waste away. Giving 4th line w/ some less experienced players means final Forwards adjustment means Carlyle goes XD
Defense:
As stated by others, core of Lindholm, Manson, Fowler, Montour is fine. Personally still feel you balance those lines better...Offense + Defense, put Montour w/ Lindholm, and Fowler w/ Manson.
Pettersson showed he can hang. Find a reasonable 3rd line D as a signing or just promote from within via Larsson or whoever. We definitely have a lot of prospects we can trade if necessary. Need to keep 2 top D prospects for injury relief.
As for all prospects, let the rest continue developing...Depending on if Steel can hang or not, Steel, Jones, and others all have plenty of time where we can continue developing.