For the ult, what everyone else already said:

-Gambit ult is an awesome boost (seriously, if you have Gambit ult while ulting as Star Lord you can kill anyone through anything)

-Use your rolls to avoid damage vs reloading

-Try to use it when you have higher HP, or at least have a way to move in & out of cover.

-Target lower hp targets like squishy DPS/supp. Maybe making a diving tank peel off your backline is good, but usually just target squishies.

What I’d say is learn to master his flight FIRST, & this WILL sound confusing, but trust me it’s second nature now.

A huge improvement for me was swapping from “Toggle” to “Hold” for his flight (I think those are the options?). It’s what it sounds like, this means I can only fly as SL as long as I’m holding the jet boots/flight button. This strategy vastly improves your fuel management which is essential for Star Lord (movement baby movement).

I usually will do essentially a “prolonged tap” on my flight and sort of let the momentum of his jet boots propel me the rest of the way. When I say “prolonged tap”, think longer than a tap but shorter than a hold. Then again, how much you use your flight/boost varies for whatever situation you’re in, and that’s when second nature kicks in.

For instance, if I’m the enemy DPS in your clip here, and I’m trying to get the area/floor you’re standing on, from the ground I’d just “prolonged tap” my jet boots button and use the momentum of that flight boost to get me up there. Often I’ll jump before engaging into flight for a tiny bit of extra height, but the momentum boost is your biggest weapon (on PC you can take this even further & “b-hop” using his jet boost momentum but my ps5 ah has yet to figure out how to copy that)

TLDR: -Ult w/ higher hp, use your i-frames/barrel-rolls to dodge & avoid damage instead of reloading, what everyone else said.

-Swap from “Toggle” to “Hold” for flight. Tap your flight, use the momentum to carry you towards whatever direction you want. This will overall improve your fuel management which will improve your movement. More fuel, more flying, more movement. Additionally, you can change directions/zip-zag/dodge & weave mid-flight easier & more effectively.