so i found 2 glitches on the pc version of the game, so not shuire if they work on console.
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the first glitch i found might help with flying faster basicaly if you crash into something the game gives you a speed boost and you maintain speed when drifting so if you crash while drifting it shoots you into the direction you are pointing and this can be faster then regular flight. this also works with the surface of water.
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there is a pice of colision the devs forgot to put in, so you can just go out of bounds and cruise arround as a submarine and you can even enter the green "gate" without visiting the previous 2 demigods.
sadly i am not good at the game but i'll give a speedrun a try.
update: i did a practice run and with my sloppy flying i finished the game in under an houer
here you go :
also when returnung from duskprism the door will still be shut but you can just exit to main menu and load the save again in order to bypass it