Tips and Tricks to get around diamond 5 MMR slump

I feel that in many of my games I do fairly decently, as in peeling correctly on support, meaningfull ganks while jungling and objective control, and the strengths in lane to weaken many opponenents and open up my path to roam into other lanes. I feel that I am just not making the same impact that I used to have on the elo and the mmr slump of dimaond 5 where you lose many more points than you gain has made it problematic to gain elo. Any tips, Note: I understand that I need more wards when im not jungle/support