I feel the same way. Up until season 7 ended, I loved this game with all my heart. I was completely passionate about it for five years, non-stop. This changed twelve months ago.
Starting season 8, League turned into a oneshot fiesta and a lot of champions lost their identities. Everyone deals a massive amount of damage and strategic teamfights turned into three seconds of button mashing. The calm aspect of the game, the part I loved most, completely vanished. Got seen/hit first? Die. We became a Call of Duty MOBA.
For the first time in my life, almost every game of League felt empty, unsatisfying or frustrating. I kept telling myself: 'be patient, there has always been rough patches.' I kept telling this to myself for twelve months. I thought something similar to the old rune system would finally return, but this pre-season is a joke as well. Everybody still gets blown up immediately.
I can not take another year of frustration. It is sad, but I guess I will turn my back on this game after six years and spend my free time meaningfully again. I really do not get how Riot does not see they could slow down the decline of their game massively by just reverting the rune system and champion base stats. It seems like the Chinese internet café scene is too important.
I just want my favorite game back, but I guess that does not happen.