Movement tips?

I'm a Juno main but have started getting into Mercy over the past month (currently level 33 on her)

I think my positioning itself is okay and my staff usage is fine, but I see other Mercy players flying around getting high up in the air and it's like, how do I do that??

Any tips or advice on making my movement less predictable to the enemy team would be so appreciated (˶˃ ᵕ ˂˶)

extra context just incase it's needed:

• I'm on console

• My sens is 65% both horizontal and vertical (I don't want it too high in case I need to go battle Mercy and I need to be able to see where I'm shooting lmao)

• Left stick custom dead zone (outer) is 0.30, Right stick custom deadzone outer is 1.00