Welcome! There's a rather large gaming community on steem, @steemgc - and there's even dlive, which lets you stream; and get paid in the same way as steemit will allow.

There's definitely a niche that still exists for good content about retro games, and that sort of content tends to prove pretty popular around this parts.

Don't get discouraged, and don't let your broad interests dissuade you from pleasing the masses. Just post for you. If people like your stuff, they'll come!