Some random thoughts; I mostly fish smaller waters.
The most important new gear you could buy is a sonar. Garmin striker 4 is $120 new. Helix 5 is 200ish on ebay.
+1 on getting the musky gear out and see what you learn
When in doubt, cast the opposite direction from where you are catching smaller fish, usually the same spot but casting to deep water vs shallow.
If you get on a topwater bite, there's something about buzzbaits that just seems to draw big fish.
I don't think night fishing will be a big deal, doesn't sound like you have a bunch of pressure.
What's the biggest juiciest slowest forage in the lake? Might be somethin better than a gill presentation.
Find the deepest spot on the lake and just sit there for a bit and see what you start to notice being still. There's one or two prime directions from that spot aimed towards great spawning. Maybe a point leading out to that deep water. And hopefully a couple of interesting features on the way, but you'll have to fish around to find them (like dropoffs and flats). If it's pretty regular/featureless, there may still be small changes in bottom that make a difference, or changes in the shore cover.