That’s what I’m doing too but it’s not necessarily ideal on desktop. There’s also https://alexandrite.app/ for a dedicated desktop experience
To find a good instance, you can just check this site: https://join-lemmy.org/instances - I’d suggest reading the description of an instance and then browsing the home feed of that instance to see if you like it.
For communities, you can just switch your feed to “all” and browse through posts and see what interests you, then follow that community it was posted in.
I’m on feddit.de - I was on lemmy.ml before but unfortunately the default instance is getting hammered pretty hard both by real users and apparently also DDOS attacks now.
Feddit.de is hosted close to me and therefore very quick and also reliable. It’s one of the biggest lemmy instances but small enough to be well moderated.
Some people might argue it’s a different thing but for me individual YouTubers have replaced the role gaming magazines / websites took in the past. I follow a few who tend to enjoy the same games as I do. They usually do not release their videos right when the embargo is lifted but take a bit more time - which I enjoy.
That said, I could see how a fediverse focused gaming outlet might fill a niche. I don’t think anything like this exists yet and existing outlets barely have a presence here (or I didn’t notice, I haven’t exactly been looking for this).