>>1702905meme replies aside what do you want us to say? you just practice until you get it or you dont, theres nothing else anyone can do. I'm sure theres 10 thousand guides and youtube videos if you google exactly what you want, why are you asking a bunch of retarded internet autists who roleplay on a chinese leatherworking forum
if you want my take just put the seat as low as possible and build up some speed and try to balance, if you ever lose balance you can just put your foot down, if you cant even start there maybe you need a different bike? fatter tyres? idk, im sure you could rent a mtb from somewhere just for this occasion for cheap.