As someone said this is a black hole, it totally is. Basically you need to figure out what you want to shoot, how portable, and what lenses to get, from a brand. Basically try and narrow it down. Everyone is hot for mirrorless, for a few reasons, but some of those reasons don't add up anymore. Like size and cost vr more traditional SLR's, but the dynamic range and colours are edging out SLR's but editing has also a lot to do with that.
Anyhow if you can't figure it out, don't beat yourself up about it, photography is part hardware and artistic skill. Plenty of people shoot great with just a normal camera body and 50mm lens.
You can always go down to Vistek (I was going to say Henry's but I think they went out of business at the beginning of COVID) and once you have an idea of body go play with it with a lens or two. You can also rent, but this is tricky depending on your budget, but a great way to test out a camera for the week-end, and see if it matches you expectations.
Don't count out your iphone 11, if it is a 3 lens model, it's almost like having a SLR with with different length lenses, and some of the computational photography in the mobile space is very interesting and can be fun.
You can go here for more info on cameras:
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www.dpreview.com
I am sure you have checked out instagram, find styles you like and chat with the creator and see what they are shooting with.