why people cant climb in ranked

i know why peopel cant climb.... good players makign poor choices liek no tpushing or takign advantage of gettign baron after killing 4 of there team and we all are at full.... people rage quitting which happens alot instead of trying.... and lastly which is the same but diff people playing lanes they lose at on tere match history and not takign roles they win at , say i play zil supp and win a lot and or do awesome which is true for me and say i want to play yas mid , umm why i neve rplay as yas nor do i ever mid.... the 2nd part is playin gchamps in lanes they do play but champs they never use. if you win as supp play supp if you win as top or jungle win as top or jungle chances are you will continues to win

the last part is say im playing zed in mid and am dying alot why would i continue to build damage and not just go straight tank which does work lol focus on you is real when you ult.... peopel die alot and build wrong items or people are like 5 and 0 as adc so what does he do he backs and buys attack speed guess what you have no advantage over the otehr adc dude