Next season you need to change how ranked decay works for the highest tiers - Suggestion included

Below is a post I've been sending many times before in a different form but have never got an answer by Rioters. In LoL Support they just recommend to post this here but it seems to have no better visibility as the matter doesn't concern majority of League players.

I've heard you pointing out how you want top tier players to be active the whole season. However with the current system there is no sense playing from seasons start to the end since nothing else matters than one's rank on the final day. This is only helpful for those who play a few games in autumn just some weeks before the season is over. Now I have played over 1000 ranked games, been 5 months in a row in Challenger and have proven I deserve those rewards. Still I have a risk of not getting them if I drop so practically my efforts this far haven't rewarded me in any way even I have been a lot more active than many others.

You could fix this flaw by letting us stack as many extra days as we want in the banked system. This would allow players to AFK in the ladder if they have played enough. I don't see a problem in this because I bet more people will start their ranked journey earlier instead of spamming in the end, even that would still be an option. To prevent maniacs from gathering 100 days a week, you could just put a limit, for example "if you have already 10 stacks, you can gain 3 extra stacks per day, capped to 10 per week" or something similar. So people could now invest time to allow them to chill rest of the season.

My suggestion is fair since anyone can go ahead of these AFKers if they just keep playing and win LP. In my honest opinion this change would also improve that competition you value. Currently I just feel I have wasted time, I've gone through thousand games and spent my energy but still must play... Next year, if no changes are made, I will be one of those who makes a LP rush just before the finish line. No point doing otherwise at the moment.