We have this beautiful cactus, but it is leaning pretty heavily. I'm wondering if I should cut off a bunch of stems to balance it? Or do I need to prop it up?

In the first photo you can see a branch just recently broke off.nIN the second you can see how much it's leaning.

Backstory. We bought this soon after getting married. We lived in a condo and it was on the balcony. In ten years it grew from one foot to about four or five feet. Then we moved into this house and planted it in the garden

and from two single four foot stalks we got, in ten years, this wonderful plant. I want to ensure its survival. A few blocks down from us is a huge one that is purported to be over 100 years old.