Weight loss would help.
So would arm strength, even abdominal strength.
I struggle with getting up and down two because I have not exercised at all in a year and a half -- spend time in bed
I want to get some safety bars.
Wall Grab Bars - Textured | Bath Safety | Carex - RMB21
Also this chair in the tub/shower would work for some people.
Amazon.com: Moen DN7 25 Adjustable Tub and Shower Seat, White: Home Improvement
And this for bathtub safety:
Drive Medical Height-Adjustable Bathtub Safety Rail - Bed Bath & Beyond
Mari