Metastatic Breast Cancer & avoiding weight gain while on Letrozole ?

I’ve been on Letrozole for nearly eight years (but not metastatic cancer) and have managed to keep my weight fairly steady (I lost weight on chemo and want to keep that level). I am however much more active than before I had cancer - I took up a gym membership and before COVID went usually three times a week. I try and limit my alcohol intake, eat a good, varied diet and since my gym closed, I walk! Every day. What may make a difference is that I don’t have any joint or bone pain on Letrozole (I do have some other side effects). Limited mobility due to illness or side effects is a very real barrier to weight control. Have your medical team any suggestions? Best wishes.