Download and install the Revanced Manager APK from revanced.app/download

Now you want to download the Infinity APK from www.apkmirror.com/apk/…/infinity-for-reddit/

Now you open the Revanced app, go to the Patcher screen and “Select an application.” Tap storage and navigate to the Infinity APK you downloaded. Tap “Selected Packages” and tap the gear next to “Spoof client.” Enter your ClientID, which you get from:

reddit.com/prefs/app

After you enter that, tap Patch and wait patiently your modded APK. Now install that and you should be set!

Obviously you should test any APK on VirusTotal (or similar) to make sure they are not malicious, but yeah. Please downvote me to hell if any links I posted are bullshit.