Droid-ify - much nicer F-Droid replacement front end that also works with Shizuku to automate installing updates in batches. Also supports many other repositories like izzy-On-Droid (which some of my items below may come from instead).

Shizuku - gives elevated powers to apps written to take advantage of it. Not quite root, but definitely helps give abilities that make life easier.

Kompact Image Compressor - I work with scanned documents a fair amount, and this new app has already saved me significant storage space.

Key Mapper - I mainly use this for emulation, but there are plenty of other uses.

URL Check - powerful sanitizer with the smallest footprint of those I've tried.

DropCount - my latest game addiction

Keyboard Switcher - sometimes I just gotta use a different input method, and this provides a consistent easy way to switch

Hail - group apps to freeze all in one shot with Shizuku

Insular - de-Googled Island app which makes working with the work profile feature easier

FFUpdater - keeps my collection of browsers & Thunderbird up to date automatically with Shizuku