
Blokada or AdGuard - prevents a lot of ads in other apps.

Especially useful in combination with any torrent search service (I would make a recommendation, but such apps seem to frequently disappear from Google Play).

Date Status Bar combined with AutoStart - Just makes it easier to keep track of what day and date it is. Split Screen Shortcut - Restores split screen functionality. Translate - I reckon this might be preinstalled on your device already. AOSP WiFi Keyboard - Useful if you ever want to use your computer as a keyboard on your phone. I use this to manage volume and screen brightness sliders. Bottom Quick Settings - Notification Customization - Enables you to access various settings by swiping up from the bottom of your screen. Tachiyomi - Superb manga/cartoon downloader and reader, if you're into that. SoundProfile (PAID) - Allows the user to silence notifications without silencing call volume ( info) or vice-versa, among other sound setups. Should be unnecessary on Android 11, where a Bouncer-like functionality is supposedly built-in already. Bouncer (PAID) - Helps limiting Android permission access. Allows for a lot of easy app icon customization, if that appeals to you. Icon Pack Generator + Iconzy + any launcher which supports custom icons + one or more icon packs you enjoy, such as Viral. DiskUsage - Great tool for determining what is using space on your device. Please read the app's documentation, as the app has the potential to mess up your device. SystemUI Tuner - Unlocks incredibly useful customization options. Termux - I use this for youtube-dl to download video and audio from various websites, see YouTube-DL the easy way on Android. There are also free alternatives that might work just as good.

SKVALEX Call Recorder (PAID) - Doesn't work overwhelmingly well on non-rooted phones, but better than nothing I guess. Unlike most shopping lists (last time I checked at least) it can sort entries alphabetically. OpenCamera - One of the better camera apps out there.
