Like Gill and Allan, I too am wondering why you feel you need the extra MP.
I shoot a lot of landscapes as well and 3 years ago upgraded from my Canon 600D (T3i) (~20MP) to the 90D (32MP). But to be honest in good light the difference in image quality is not that much more in the 90D. In low light the 90D is streets ahead of the 600D as you would expect with ~10 year gap in technology developments.
The extra MPs in the 90D is not the main reason I chose it for my upgrade. It has other features I liked/needed as well.
I also do a lot of my own printing of landscapes and panoramas and the extra MPs on the 90D certainly help in outputting slightly better large prints but unless you do a lot of large printing I am interested in why you feel the need for more MPs, especially ~61MP you preferred camera has.
One thing to be wary of when going to much higher MP cameras. Just about the first thing I noticed going from my 600D to my 90D is that I needed about 1 stop faster shutter speed, even though all my lenses have IS, to avoid camera shake when hand-holding because of the much smaller pixel pitch on the 90D. The 600D was much more forgiving of camera shake than the 90D is.
After some practice with and concentrating more on my hand holding technique my hand holding shutter speeds have come back to near enough to what they were with my 600D.