What criteria would help me identify the most suitable adjustable dumbbell set for me?

After a half century of life, I realized I needed to start lifting in order to reverse the loss of muscle mass that comes with age. I educated myself on progressive overload and found a basic, twice a week 6 exercise routine, and bought a small set of adjustable weights--5 to 15 pounds. I thought it would take months to build up but it only took 6 weeks.

So, I am in the market for either a replacement or another set. There are so many types--I don't want to have to replace this new set for some time, but I have no idea where this type of journey ends. (My goal isn't to be an athlete or a bodybuilder, just being able to carry groceries when I am truly old.)

What sort of maximum weight would be realistic for the foreseeable future, and what other criteria should I factor in?

Thank you.