Thankfully my shower has a very little lip (less than 1″) so is really a zero entry and I don’t have this issue but do for simple things like putting on pants! they say “everyone puts on their pants one leg at a time”…but some struggle so much more than others I always think ;-0
There is a little device someone at church showed me that is like one of those handles you get for an invisible dog…it is a stiff leash with a loop at the end….she has one and can just reach down with it to grab her foot to lift it. I was considering getting one for the days my foot is harder to reach than others! may set something like that or hang it in the shower?