How to win promos [Serious]

I'm having a lot of trouble winning my promos, not sure what is going on, I've tried 3 times today and failed every time. Does something weird going on with the match making? I win every game leading up to promos, just seem to not be able to carry the promo games. Maybe I should wait for a duo for promos? I dunno, either way it's really frustrating that I've won more than I've lost today, yet I'm down 60LP
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