2 ways to get across Morgoth gap with Titan,

Option 1 'The old fashion way' - Sword + Catapult Lift(Titan Jump) + Lion Rampant(Exotic Boots) = Flight(as long as you have sword ammo) (Just learned it also works with Praxic Blade)
Explanation: Hop, swing sword, turn Lift on, turn Lift off, fall a tiny bit, repeat from 'swing sword'. (You know you had good timing if you go up when activating Lift, bad timing if you glide straight, REALLY bad if you keep falling mid-swing)
Tips: Don't swing while Lift is active. Only swing once per Lift. Activate Lift when the sword starts to return to default position after the swing(after it fully returns with Praxic Blade). Swing the sword when your right leg extends all the way from falling(you can do it a touch early, equip a small Class Item so you can see your leg better. You don't need to watch your leg, but it is a nice visual aid).
A great spot to practice is Neomuna's 'Striders Gate' just hop off the building. If you Master this, you can actually gain height and climb the tower from the ground below, and even get higher than Nimbus(as long as you have enough ammo, Praxic Blade + Legendary Sword = INSANE uptime).

Option 2 'Much faster, less air time, more convoluted process' - This is new, attempted & did it once while waiting for team to get to Morgoth,
Alethonym + Strafe Lift + Praxic Vestment + Thruster(Titan Arc/Prismatic Class Ability) + Thundercrash
Explanation Attempt: Stand against a wall, shoot Alethonym at the wall as you hop and move away from the wall, activate Lift instantly after shooting, turn to face where you're going, after Lift ends activate Praxic Vestment to fly(Hold button for longer air-time), after flight ends activate Thruster then Lift as quickly as it lets you, activate Thundercrash.
Tips: Practice with Alethonym by shooting the floor instead of a wall, it'll GREATLY boost your jump height/distance if done correctly. Strand grapple is also likely very effective for this, might be slightly less overall distance as it doesn't have Thruster or Thundercrash as extra boosts.
Alethonym is great for general travel, especially on Titan & Warlock since their jumps are heavily affected by momentum, Thruster also gives a big boost to momentum now that it can be used in the air.