What tips do u want? Just open match history, put ranked and scroll. Your summoners change position very often. Its clear that 2+ people share account. Basically games between 11th june until 13th june are boosted games. Basically , Flash changed to F, you suddenly started getting massive CS, you won all but 1 game and then suddenly changed Flash to D and played like always.
Stop boosting.
Meanwhile I reported someone via a support ticket because I KNOW they got boosted and yet they still haven't been banned.