Note that if you do decide to get one, make sure to look at models from other brands, like Canon, Nikon, Fujifilm, and Panasonic!

For Canon, it looks like their "R" lineup is higher end with smaller numbers, e.g. R5 series is more expensive than R6 series. They have a mix of APS-C (like the R10 series) and full frame (like the R5 series). Their lens ecosystem is quite restricted, so you're mostly stuck with first-party glass.

As for Fujifilm, they sell APS-C cameras (+ medium format, but most people shouldn't be looking at those), and they lean into the mimicking analogue / film photography with lots of dials, film simulations, etc. If you're into that, Fuji is great! The X-Tx series are their "flagship" APS-C cameras, while the X-Txx are cheaper models that have fewer features. The X-Mx series are their smaller bodies, while the X-Sxx series are more video-centric. The X100 series is very popular, but it's pretty expensive and has a fixed non-interchangeable lens. If you do want something compact, I would go for either the X-Mx series or another brand's compact camera lineup. Fujfilm's X-mount has a similarly vast lens ecosystem to Sony.

Nikon sells both full-frame and APS-C cameras, and their Z-mount lens ecosystem, although not as large as Sony or Fuji, is still quite open with many third-party options available. Their Zx line is their full-frame options, where bigger numbers are higher end. So the Z9 is more expensive than the Z8, for instance. Their Zxx series are their APS-C bodies, I heard the Z30s are very good value for what you get. You also have their Zf and Zfc, which look more "retro" and have a similar design to the Fuji bodies with metal accents, they aren't the best value on features alone, but if you like that design and want to use Nikon lenses, it's a pretty neat option.

For Panasonic, you have the G lineup of M43 cameras (smaller than APS-C, larger than 1"), which are relatively compact for the most part, as well as their full-frame S lineup. For the latter, the S1 series are their "flagship" full-frame body with all the bells and whistles (+ the price tag that comes with it), while the S9 is a very compact full-frame body that is pretty divisive on the Internet. Their S5 series are their more standard full-frame option, and are quite good value for what you get. Their G series has a bazillion different models with a very difficult to remember naming scheme, not to mention how they can differ between region. A lot of the discontinued models are still very popular on the used market, like the GM1, GM5, GX800/GX850/GF9, GX80/GX85, etc. since they are compact models that Panasonic doesn't really produce anymore. All of Panasonic's lineup use the same L-mount, which is a shared mount between Panasonic, Leica, Olympus/OM-System, and many other companies. The lens ecosystem is second only to Sony's, and many of the M43 lenses are incredibly compact!