The market has been hit hard with new mirrorless cameras. They are definitely the future of digital, compact, lightweight and also expensive. I personally don't love the "feel" of a mirrorless body in my hands.... but I know that's a personal preference!
If you are interested in a mirrorless, This is the Nikon Z50
(pictured above left bundle). It's the most affordable, new Nikon mirrorless camera on the market. It is a crop (DX) sensor, which is part of why it is less expensive. The Z series also has it's own set of lenses, but an adapter does exist for the traditional DSLR lenses. So, if you are upgrading to mirrorless, get the adapter to use all your current lenses.
If you aren't looking to spend that much, you'll be in the market for used gear.
I am still very much in the traditional DSLR camp. I like the weight in my hands, and the physical mirror open/close. My professional camera bodies are a D750
(backup). I love them both so much, and it will take a lot for me to want to upgrade from them. The D750 is still in production, but the D700 is not, however you can still find them refurbished.
I know these professional bodies are likely outside of many price points, so here are some good less expensive options. Remember, less expensive means it will function, but it may not be as easy to use, or produce as high quality images as a professional body.
offers the full function of a DSLR, but with a smaller price point. It's relatively small in your hands and is a bit lighter. It is a crop sensor. It will still come with the factory warranty!