You can maintain speed by bunnyhopping. (holding space)

You gain a bunch of initial speed if you sprint right at the start and when you jump down a slope.

You dont need to sprint during the bunnyhops. Most of the time its a waste of stamina because sprinting in the air doesnt make you faster.

You can cross large distances if you jump off a slope while eating stamina shrooms . Ofc picking up shoes and jetpacks can also help a bunch. Just dont pick up too many jetpacks, as having too many will make your jump higher than you need it to be.

Note: id say these are the very basics ,if you want me to change or add anything lmk