Need some assistance from experienced players.

Alright. according to the Riot game tips : ''losing a game is your own fault'' i need some help with this. How do i play as a support,jungler and top laner at the same time? i can pick smite and teleport on support but that will get me banned. because nobody ever did it in the tournaments so its not ''meta''. how in the actuall fffffffffffffff do you play in 3 lanes at the same time? and no im not blaming my teammates for this because its my fault i cant play supp jungle and top at the same time.
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