I could afk every game and the outcome would be 99% the same

so... what you are implying is that you are that terrible of a player that your team would not notice your absence? if you feel that unmotivated to play or even attempt to improve why are you even playing the game to begin with? there are plenty of other games out there. Go take a break and comeback and see if you feel motivated again if not then just stop playing league altogether, no one is forcing you to play league

if you're unmotivated to play just find another game, if i ever get bored with league i read a book or switch to whatever indie game i could pick up for sale on steam

Then stop playing the game competitively and only play TT or ARAM? That or simply only play during the gamemodes. If you take a break from the game only to come back for the gamemodes. You'll at least be relaxed and have had a small break.

The way it works out is when you are close to your skill level you feel less impactful in your game. This is when it i a good time to take break from ranked and mix things up in some normals until you improve. It is actually possible to impact a game so much you turn wht would/should hve been loss into a win which is what causes you to climb the ladder. In order to consisently make this sort of impact you need to be much better than the other 9 players in your game. If you are gold 5 player in silver 1 it could easily take 30-50 games to go from 1 to G5. If you are P5 player in S1 it would take 7-10 games, maybe less if LP gains are high enough by the time the P5 player got to S1.

Also, forgot to mention, since setting goals lets you track your own progress you'll have a better understanding of when you can help your team and make huge impct and when you need to play safer because you are behind nd can't afford to fall further behind.

That doesn't really make any logical sense. The chance of you winning in a 4v5 are extremely small, probably less than 10%. So what you're basically saying is that when you actually play rather than afk you only have a 10% win rate, which is also absurd. Your post is basically you whining about how the sky is pink when the sky is clearly blue.