i fcking hate iphone

so i want to download genshin impact cause i want to try to play but the "other" storage on my iphone take half of my fcking storage and i have deleted all my photos and apps and that shit is still the same, fuck. i want to buy a phone but i have no fucking money, btw i have seen some videos on youtube but idk if that works or not, can you tell me how to delete the "other" storage??? help please