How to improve Ranked Competition

Been thinking for awhile about it (improving the Rank incentive, while diminishing toxicity), seeing and reading regarding Toxicity Players during the Rank match-ups (even during picks), i personally don't Rank (i just watch my younger brother matches). However, i do feel like the system could be improved by adding some more incentives (i know there are already incentives).

What kind of added incentives? (you may be wondering). Had trouble to figure out one, but i came with an idea for one: Could it be possible to add previous victorious/championship skins to the reward system, but, INCREASING THE LEAGUE RANK REQUIREMENT TO - DIAMOND 1/MASTER/CHALLENGER League? And with the requisition of already be owner of that Champion of which skin you try to obtain? (and maybe with: X number of matches played with it).