Every game is so one sided these days :/

Ive been playing lol for 4 years ish now i think I'm not quite sure, but a while anyway, and only this year have games been getting so one sided, its ridiculous, like every game is 8/35 or 40/10 or something stupid like that, and tbh I'm sick of it, nether team has as much fun as a good close game. why is it only this year that this has been happening? is it an imbalance in gameplay or buffs/nerfs or what? and how can we fix it?
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