Expand your network and play with strangers. It will open a new world for you.
Playing with the same guys will get you in the comfortzone. You know their strength and weaknesses by heart.
And tbh. if you always end up at the bottom 3, you are probably not so good yourself. If you are a level above your friends, it should not really matter if your partner doesn't move that much.
Short anecdote. There is this older guy with bad knees that sometimes asks me to play with him. He comes from high level squash and can definitely play (has a great hand), but he just doesn't move that well, stays in the back a lot, etc.
Hence, he's stuck at the intermediate+ level. I'm advanced and when we team up against other fit intermediate+ guys, we usually win.
Even when he doesn't move, cannot run, etc.
When he serves, he wants me to switch sides (no australian formation).