@AliceB777415 almost $5,000 per year is nothing to sneeze at. I would assume you have the F plan. The one that covers all of your Part A and Part B OOP expenses.
Changing to an Advantage plan will save $$ on a monthly premium but there is an offsetting downside.
You lose the ability to use any doctor, including possibly your own.
In most areas your OOP for health care would go from $0 to $6700 per year. That is only for IN NETWORK APPROVED medical charges.
OON (out of network) charges raise the ante.
Many specialty centers such as Mayo, Cleveland Clinic, MD Anderson, etc do not accept most Advantage plans.
Advantage plans are wonderful as long as you are in good health and are not particular about which doc you use.
If you are in good health you could do what @GailL1 suggested and look for a lower premium plan that is less comprehensive than the F plan.
A few states allow you to change plans without underwriting. Some have a birthday or anniversary rule. Others have no underwriting at all or have a carrier of last resort that will take anyone. These scenarios are limited to about half a dozen states so the odds of having these options are not in your favor.
Ask your friends for a LOCAL agent that specializes in Medicare plans. Dealing with national agencies, SHIP counselors and even 800-MEDICARE can be a crap shoot.
Bark less. Wag more.