Ok, here's some things I noticed:
-You should only approach with cyclone from midrange or closer, doing it from far away is incredibly unsafe
-Luigi's fireballs are not useful for zoning, they're best used for edge-guarding or covering your approach/recovery, and in Melee they're good for Vudu-dashing, but I'm not sure if that's still in PM or not
-You roll into your opponent a lot, try to break yourself of that habit, as Luigi wavedashing should be your primary method of evasion and mobilization in general because Luigi's ground and lateral air speed are pretty unremarkable
-Learn to edge-cancel your missiles that's the most efficient way to charge your misfires
-Luigi can CG Lucas, Ganon, and D3 with dthrow and Falco with uthrow, so work on knowing what percents you can do it to
-I noticed you rarely jab, you should experiment with Luigi's jab, he has one of the best in the game imo, and you can cancel jab1 and jab2 into tilts, smashes, grabs, even up-b, so it's definitely something to utilize (generally jab1 follow-ups are the better option)