Trying to keep champs happy

I have no idea why but ever since i started trying to master azir my other midlaners such as ori,ahri,yasuo has just been worse then how i use to play them. These 3 champs haave carried me for years but now im just not as good.and i still want to get better as azir cause i am rlly good on him.I donthave enough time to keep my skill level on point with other champions.can anyone reccomend me any tips to keep my champion pool on point?Cause rigjt now im on a long losing streak