To be perfectly honest, Lemmy has had staggering growth regardless of the lack of media attention. And I’m not entirely certain that’s a bad thing.
Look at my home instance of lemmy.world, for example. When I joined pre-blackout, we had around 800 members. Now, two server upgrades later, we’re at nearly 18,000. If only a fraction of those newcomers stay, it’s still enough to jumpstart organic growth, even if it’s slow. And it gives us time to really develop.
Maybe that’s a glass-half-full outlook, but I’m optimistic.
Internet is a finicky thing. What you should be getting depends a lot on what you pay for, what device you have, and the equipment you’re using, not to mention the infrastructure you don’t control. Without more detailed information, it’s hard to say. But, that said, your download and upload speeds are more than enough to do practically anything you should want without much of an issue.