You get out what you put in.
That's it. That simple. That's why people go through this sweet spot after they start getting good where they have a lot of fun, then turn into bittervets and come rage on the forums.
Don't be so ****ing apathetic. That's the best advice anyone can give anyone in this game.
Use chat, get engaged, make a mech to play a role. Don't get so bunghurt (thanks Bish!) when it doesn't work out or nobody listens to you. Write them off and try again next match.
Most of your team won't be engaged and invested. You change that by being engaged and invested. Much like memes and urban legends it spreads on its own by osmosis. People are bitter, disaffected twits because they drop in most matches with people who act like bitter, disaffected twits.
