What changed ?

Hey everybody, It has been 8 months since I quitted League, and gave this account to a guy. Now I feel like returning to the field of justice, but as I have seen, a lot have changed. Instead of spending hours to see videos, I want you to tell me which levels League has changed, not the detail (jungle, champs etc.), I also want to know if there was any change in the leavebuster's system, and finally, is it worth it returning to the field, since I originally quitted because of the toxic players. Thank you very much for answering my questions ^^
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