This isn’t particularly helpful, but getting off of 
is gonna end up being a good thing, long term. There’s been a hundred incidents these past few years that have frustrated me on traditional social media. I was very annoyed at the time, but the end result was to get me off their terrible platform, and my mental health has been way better.
If you want to read reddit without posting, just access via old dot reddit dot com. There are browser extensions that do this automatically, which are amazing. You can even access NSFW stuff if need be.
If you need to post to again, you almost certainly need a new device. Reddit probably blocked your MAC address as well as your IP. But you’d probably need a new router cuz that has a MAC address as well. There’s weird ways to change or spoof MAC addresses, but AFAIK they’re not simple.
Maybe someone can correct me on the last paragraph, as I’m only 90% sure.
Actually you might be right. I was just a bit lazy to research it.
I’ve just seen enough Wikipedia sockpuppet investigations, where the server admin can see what device you’re using. I’m assuming that they can often view your OS and device name, which indeed are easily changable.