why my teammates are so bad now

The only solution to your problem of getting bad teammates is to use voice comms and find people to play with. Even if you can just find one other person to duo queue ranked games or even pubs whatever you prefer.. Having 1 other person on voice comms will often help keep your third with you and keep them in the fight. Call out everything you do that is relevant to your teammates whether it be to push a fight or play it slow and hold back. Ask your teammates what they need whether it be batteries, a weapon attachment, ammo.. etc. Make sure to also let them know if you need something. Most of the time if you ask polietly that you need a certain item you will usually recieve it. Sometimes people are greedy and or just don't care but most of the time I have found if I just ask I will get the item from them if I am nice about it. Honestly the best thing to help random teammates is just to communicate non stop. When you are rotating to a new location make sure you mark it and say things like "this area is good because it has cover and is on high ground". I am sure you already know these things that I just mentioned but unless you already have people to 3 stack with, there is no other choice.