Maybe have a look around at possible (crash) landing areas and clear away large rocks and logs, probably sounds stupid, but if it were me at least I’d know there is nothing hidden where I might just end up.
Also with AndyRT on the ‘it’s in your head’ and the start small + armour.
If your confident with jumping wait till it has less green and has more grip. If not, practice jumping the same gap at least or larger until you have the confidence to jump a ? ft gap without thinking, then wait until it is less green and has more grip.
My 2p
Carl