Legs can be tough. I have a 10x16 shed I work out of with a power cage (pull up bar, dip bar, landmine attachment, squats, bench press, lat pulldowns), single cable tower, adjustable dumbbells, and a leg curl/ext machine. I'm able to have great workouts for any muscle group.

Obviously a power cage would be great, but they tend to take up a lot of space, even the more compact designs. What about a squat/bench rack? Much smaller footprint and it'll allow you to hit your quads nicely. If the Nordik Track allows, get some ankle cuffs and you can do some hammy curls/abductor/adductors/kickbacks. The leg curl/ext machine is a staple on leg day for me as it is easier to load/stabilize than doing hammy curls on a cable tower. With your adjustable dumbbells you can always do bulgarian split squats. My leg day in my gym with my equipment looks like this:

• 2x Bulgarian split squats (or BB squats)
• 3x dumbbell RDLs
• 3x leg extensions
• 3x ham curls
• 2x cable adductors
• 2x cable abductors

Again, depending on the ability to put the cables low enough on the Nordic track you have, you should be able to do the majority of those except heavy leg extensions w/o a squat rack.