I switched from showers to baths and my personal hygiene has improved sooo much.  I'm still not perfect, but way better.  In the bath don't feel overwhelmed by water pounding down on me, the noise, feeling like I'll slip and fall at any moment, etc.  Baths also take a lot less energy and effort because you're sitting down instead of standing, and because of that I find it easier to convince myself to get in the bathroom and bathe.

Idk if it's just me, but those were big barriers when trying to shower because I felt overstimulated and paranoid and scared.  In a bath you can hear what's around you, and you can keep the shower curtain open to see everything around you.  Sitting in a warm body of water is very relaxing for me, so I look forward to baths whereas I used to dread those overstimulating scary showers.

Maybe it's odd for an adult to take a bath for cleaning/hygiene purposes, but hey who cares.  Embrace your inner baby.  Whatever works.