Tay, sorry to hear about that. I am 78, had a pinched sciatic nerve a year ago and it + injuries over the years to my knee has my left leg kind of iffy. So with or without my mobility scooter I go for small and light if I have to do any walking. So I understand your needs a bit.
I am a Canon user mostly and for small and light I say go with the newish "R" series cameras and lenses.
Look here at the Canon online store:
https://www.usa.canon.com/Click on Cameras and you get choices, I recommend the "Refurbished Cameras". I have bought several over the years and all are great. They may be show cameras, overstock, returned by buyer etc. The factory techs go over them more than the assembly line inspectors do and adjust etc. So I and others consider them to be certified and better than new in box.
Click on "Lenses" and you get the same.
They are the best bang for your buck as all are reduced below new in box prices even though they have the same warranty.
Do you want a Full Frame for wide angles and low light for your street and landscape photography or an APS-c crop sensor to get even smaller and the 1.6x "reach" increase on each lens? I have both in the R series, I have an RP full frame and and R7 crop sensor.
The RP is the simplified body without a top window so you do everything through the view finder. My R7 is the top of the line crop sensor with all the bells and whistles but still not too pricey. (I do a lot of birds and planes.) They do have very good simplified crop sensor bodies at lower prices.
I can also recommend a fixed lens "bridge camera", I own the Sony RX10IV which has been rated the best bridge camera for several years now. List price is $1700 but Abe's of Maine has a sale now for $1300. For a 1" sensor it takes great pictures as the lens is a Zeiss design.
I will give you two recommended 2 lens kits, one with the RP full frame and one with the R7 cropsensor. I will give the best prices I found. On the Canon refurbished site if they have the item in stock it will be a nice price reduction.
Canon RP full frame with 24-105 lens $1300, and add the non L 100-400 lens for $500 to $550. Full frame camera lenses that cover 24-400mm for $1800 to $1900. I have this camera both of those lenses, they are very good and produce great images.
Canon R7 crop sensor with 18-150 = $1800 and add a 100-400 for $500-500 (the FF lens will fit the crop sensor body) and being a full frame lenses on the crop sensor body you get the equivilent of a 160-640mm lens. I own and use these also. Great images.
There are a lot of excellent EF mount lenses both new, refurbished and used on the market that will fit an R body with an adaptor. An EF to RF adaptor made by Canon will be about $100 for the simple straight adaptor and $200 for the more advanced adaptor with control ring. Again I own both of these and they work great. I can use all of my EF mount lenses including my Tamron 150-600 telephoto. I do a lot of birds so I love long lenses.
If you have a big camera store near you go in and look at these, handle them etc.
Best of luck with the surgery etc.