Welcome Zenraika and new apple snail!
What are the water parameters and the temperature?
pH - important as well
other things like
general hardness / GH
Calcium / KH
How long has your tank been running?
Are you familiar with the nitrification cycle?
A great bunch of information about aquarium keeping / link is located in the signature of my post. Check it out.
A first suggestion would be to do a water change of about 40-50% and see if the snail gets more active.
New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?
Start here - Aquarium Advice Article
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves