Hi there! In a game like Overwatch, where placing runs on a bell curve, you can get to diamond with decent aim and basic commands. Communication is important though when advanced strategy (beyond “using our ults at the same time”) is necessary to win ranked games. This is where voice comms come in. For me, I use a system with my friends to express communication in various competitive video games, but for ranked that is not always an option. Avoid mentioning your hearing, as it makes people rage (yay, ableism); instead just continue typing and people will eventually use that instead. If people give you a hard time for not joining voice comms, just say you can’t at the moment. 

I think there is nothing stopping you from climbing higher! You got this :)