Permanent ban from league of legends ( 4months after last punishment)

So i read this post: and according to it, my toxicity level should drop 1 tier (from 14day ban to 25 chat restrict) if i didn't get any punishment for 3 months, but it didn't. 4 Months after getting the 14 day ban, i lost my temper a bit and wasn't the most postive guy (but i don't think it was ban deserved tho) and got permanent ban. I just wanted to know if it is possible to change my perma ban to 14-day suspension, like it says in that post my toxicity level should have dropped 1 level but it didn't.. And i really didn't want to lose a 4years old account with all champs and lots of skin like that :( and all the friends that I made in summoner's rift over the years.
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