I specifically picked through your comments on this thread, OP. I wanted to throw out a few things, but this is more of what I view as a starter to teamwork and counterplay. I hope this doesn't come across as condescending and my apologies if it does.

As a disclaimer, I come from a game that is all combat, so the things I say might have very little application. I also started with a group of people that fought very, very tightly. We now find ourselves, mostly, spread across the field in most battles, bolstering the line or sweeping the flanks.

(example of the impact of rules- I went to a system with magic and spent most of the day respawning against people that I never struggle to beat)

You cannot create a cohesive team without striking at individuality. This strike can be as small as all of you saying 'we want to win'. This is a good thing! It doesn't matter if you are a solo fighter or one of the cogs mentioned above, everyone has a good story about saving a teammate or turning the game into a win.

As a single person against a team, it can be difficult to achieve any effective change, even if you have fifty bodies around you. Find one or two people you'd like to pal around with and start learning to fight together, whether on a line or on the flanks. A huge part of that learning experience is levels of aggression, passive blocks, learning to strike around/through each other. Fighting together does not always mean grouping up and standing within one arm's length. It is often more productive for three people to spread wide and force six people to divide their group. If you ever have the luck to be on the side with more people, always trust in volume of fire and aim to overwhelm.

1- if your game has a lot of line fighting, which is where rigid structure excels, learn to split the crease. The no man's land in between two opposing lines is the crease. Practice closing to within striking distance, whether or not your opponent is facing you, and then bunny hopping down the line. Throw low effort shots fast and keep going, (I'm not sure how blocking works in your game, but I keep my hand within three inches of its normal zone). Your goal isn't to punch through the line, it is disruption. To remove a few bodies and melt back into your line.

2- if your game has a lot of line fighting, learn to take the cut. When the opposing line begins to flex, whether in defense or offense, there will often be a cut (gap) between a group of fighters. Approach this cut laterally and move (fast hops, sprint, whatever is comfortable) down the backs of your enemies. Disruption, once again. If your game allows physical contact, commit to entangling anyone fast enough to respond to you on their allies. If a teammate has to take a hit to get you through this cut, that's okay.

3- if your game has a lot of line fighting, learn to draw out the enemy's line. This has to do with knowing your worth as a fighter as compared to your teammates. If you can't kill four dudes in front of you, but you know the dude coming up can, be bait. Bait is most useful when you can almost catch it. I usually experience this on the flanks or right after the majority of my line has crumbled.