MID MMR Pub meta 3k-5k how do you play it out?

I have played dota for 12 years, anywhere from 3k to 5.5k, but my mind is a broken jumble of 12 years of meta's which often contradict each other and build habits that work against you, which is terribly confusing.

What I want to understand from higher level players is how you play the meta in the meta, playing with your team. Dota is a lot like driving, driving predictable allows people to avoid an accident with you, but sometimes you need extreme reactions to a game going south to salvage it?

How do you guys deal with different type of players with different types of grief or playstyles? How to you beat your teammates? Obviously flaming them wont help you win. There used to be a time where you could just farm jungle or push waves until you hit an item timing you could work with, is that still the case? I always try to identify a core or support I can work with who knows their hero to make plays with.

Several scenarios:

Supports are taking your farm as a core? Your behind the other core?

supports are just bad or aren't warding? I assume just buy all the wards and sentries yourself and fall behind enemy cores losing time? What about late game when you need all 6 slots ot be effective but your team cant be bothered to buy dust?

How do you play around a guy who clearly has no idea how to play his hero, just bait him in fights and let him die?

You show up in a lane to gank from mid with an invis rune, but your team clearly doesn't know your there or bother to stun/ or bait no matter how much you ping? Do you write that lane off and ignore it from now on.

Your have all the vision, and items you need for a teamfight, but it goes horribly wrong because some players dont press their bkb or chase some support they cant kill?

your offlaner is in brain off mode and just goes on anything he sees no matter how badly hes outnumbered? Do you go with him and hope for the best, or just ignore him and farm?

How do you solo carry a game anymore when your team is feeding their asses off? do you have to deviate from normal builds like survivability and go burst damage, or items like sheep to play for pickoffs?

How do you play around the the ridiculous stuff you see from your team in ranked dota?

I often run into the case of pick a scaling core vs a more lane dominating core? I hate getting outscaled and losing after dominating mid and early only to realize my carry is braindead and has no idea how to play his hero? I also hate games where I pick a core that scales well, but I dont have the the tools to reverse an early game feedfest?

What are your guy's reactions for dealing with the various levels of grief and idiocy you see in pubs? How do you pull a win out of a hat when you can't tell what the hell your team is even doing?