Save your Lemmy homepage as a shortcut on your Home Screen, move your Reddit app and replace it with your Lemmy shortcut.
I just opened Reddit 5x today and had to figure out how to train myself not to use it. This seemed to help me, I hope it helps others too.
Stay strong brothers and sisters. Remember, the more we post, the better it gets.
Another approach is to switch to a distractless Launcher. I personally use Olauncher, needed 2 days to get used to it… never looked back.