Ranked System for Solo/Duo needs to change

Ive been playing this game for 4 years now and I acknowledge that I am no where good at this game but the fact that this game's ranking system is somewhat flawed should be taken into account. For one, the game is designed to be a 5v5 game but when someone on your team decides to go afk, you still get punished for it even though it isnt your fault. Also when everyone on your team does bad while you are doing somewhat ok, you are still punished because of the incompetence of your teammates. For solo/duo ranked, it should be based off of your solo performance like the ranking system for TFT instead of an overall team performance. I have a solution that might resolve this issue a bit but it may not be the right choice but its a step into changing something. I think we should have a set amount of lp that we gain or lose when we win or lose a game and based off of our kda we can still have a chance to earn more lp or reduce the amount we lost. For example, lets say the amount we gain or lose is 15 lp. Like for every kill or assist, we get an additional 1 lp and for every death, we lose 1 lp. That way, for those who are extremely fed and are carrying an inting team will be rewarded, and those who are inting on a winning will get punished. Then there needs to be something in place where if someone decides to go afk making it a 4v5, there should be no punishment or reward to make it fair to both teams that nothing should be given or taken away due to an afk. This is just my idea on it and i doubt this will even make it this far but its out here so please do something with this.