Is it possibleto climb playing solo only?

I get some mad winstreak 10+ , but thwn i would get queued with afk teamates , massive intera etcetc,
Even tough i would try my best to scale and stay relevant in the game when im on the losing streak most game feel unwinnable becaise teamates become so heavy to carry

Is there somthing i dont understand ? I feel punished for doing good

Supposedly the game makes you stay close to 50% win rate.
Using matchmaking and making a whole team full of auto filled roles. Or placing you with lower win rate members?
But then again the list goes on... how did they get >50% win rates?

15% of games will be a loss regardless what you do.
15% will be wins regardless what you do.

Think of these 30% games as you have no impact. This can be from AFKs, or luck.
Focus on the 70% of games you can make an impact. Something as easy as finding that the items you're building is wrong for the matchup or that you're playing to many champions can be a big influence.
You maybe good mechanically, but not good with decision making for example.

If you'd like to, feel free to PM me if you have other questions.

Yes
As long as you have more than a 50% winrate, youll slowly climb
Years ago, it wasnt this convenient

Trying to simpify this as possible as it can get because i have the exact same thoughts.

Try to farm, zone if you can, achieve map awarness, positioning and push. Push like hell, any open oportunity for you to push must be taken, take towers, push, back and forth, team fights kinda irrelevant, u need your team to take pressure in lanes, force the opponent to chase but not to take kills,

Maybe it works, maybe it doesnt

If you are consistently out performing your teammates, you will climb.