Silicone tip AirPods fell of, possible pushed in?

I’ll assume you meant the tip fell off and disappeared somewhere, or fell off and won’t re-attach, and not that the tip still is lodged in your ear.

Here are replacements (pick your size):

AirPods Pro (1st generation) Ear Tips - 2 sets (Large) - Apple

AirPods Pro (2nd generation) Ear Tips - 2 sets (Small) - Apple

etc.

And for completeness: Identify your AirPods - Apple Support

Hello~ Any help clicking on below and reviewing?

Choose your AirPods Pro ear tips and use the Ear Tip Fit Test - Apple Support

~Katana-San~