I have already switch on the location service but the maps is still not showing me my current location.

Do you know if any WiFi access point within view of your Mac is in Apple's location database?

Do you get any location indication?

Does it show up with a very wide uncertainty circle, or is it somewhere other than your location with a tight uncertainty circle?

Your Mac has to triangulate its position from the signals from nearby WiFi access points. If Apple doesn't know the location of your nearby access points, it will be unable to determine location.

Forgot the link…

How to use safe mode on your Mac - Apple Support

Do you have Wi-Fi enabled? Are you using a VPN?

You can try booting into Safe Mode, then restart normally.

It is possible I suppose you are in a remote enough location Location Services can't triangulate your location.

Welcome.

i don't know how to check the access point. :')

There isn't a way short of having it work previously.