Any advice on how to win promo games

I m Gold 1 and right now i am in promotion for Platinum,but before that i lost like 2 promos for Plat so i feel like every time i hit promos i get cursed and cant win the games... So any advice would be much helpful and apprecciated since i am becoming frustrated every time i drop from promos and then League put me in the middle of Gold 1 with 50LP.
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