Hi Kathy. I am also a user of Nikon equipment since switching to digital about 15 years ago. Before that, I had amassed a significant collection of Olympus OM film equipment. Others have asked what you have now and what you shoot now. That is an important question, because there really isn't an ergonomically significant difference in the weight of cameras from one brand or format to another. (I am a retired industrial engineer, and managing this sort of thing is what I did for 40 years.)

The real difference in weight and in the weight distribution (even more important) is in the lenses. So a better (not to mention cheaper and less operationally impactful) approach is to see what you can do about figuring out a way to use different lenses to accomplish your photographic goals. If your cameras are fairly recent, there may be some surprising changes that you can make without impacting either your photographs or how you achieve them without ditching everything you have learned to use and to be comfortable with. And once you start thinking a little differently, you are likely to find that you can figure out what to do on your own, without having to navigate all the well-intentioned but sometimes misguided advice you are going to receive here.

I do not claim to have the final answer for you, but will be glad to suggest some things to think about once you can give us a little more information.

Welcome to the forum.

Until I bought my first Nikon a few days ago I was solely a Canon shooter. At 75, the weight of my Canon 7D Mark Ii with lenses attached came close to 4 pounds. Beside the weight there was the bulkiness of carrying a large camera and lense on my shoulder all day.

My solution was to purchase the new Nikon Z fc mirrorless DX camera with the Nikkor 16-50mm f/3.5-6.3 kit lens. A similar kit can be purchased at a relatively similar price with the Nikon Z50 body. The Z50 uses the same sensor as the Z fc.

The Z fc has a vintage form factor and looks almost exactly like a Nikon FM2 film camera from the 1980s. The Z 50 looks like a conventional modern camera. While I don't know what the Z50 weighs, the Z fc weighs a bit over 13 oz and with the unexpectedly excellent Nikkor 16-50mm lens attached the weight increases to a bit over 17 oz. It is very light weight and very compact.

Most of the other available Z lens are full frame, but are generally lighter and smaller then their DSLR counterparts. When it becomes available, I will be also be purchasing the new Z 28mm f/2.8 FX lens which is also small and light weight The only other Z DX lens currently available is the Nikkor 50-250mm. I don't know very much about this lens.

Whether my solution will work for you will depend on what and how you shoot and which lenses you will need. The Nikon Z fc has received excellent reviews. The only negative is that it does not contain in body image stabilization, which is not an issue for me.

Great suggestion.
The Canon is mostly metal (as is Nikon), the Olympus is mostly plastic. Hence the weight differential.
If weight is really an issue, go with the also much cheaper Panasonic/ Lumix; however I do not recommend because of the unsatisfactory flimsy construction and poorer glass. As weight (and size) goes, Canon, Nikon, Leica, Sony all have superior "shirtpocket" models .... details to numerous to mention here. Quality, weight, size are all considerations .... so prioritize.