My 3DS won't connect to the internet?

Okay, so. I’ve been trying to get my 3DS to connect for about a month now, but nothing works. I’ve tried deleting and remake the connection, I tried re entering everything, I tried turning my router off. Then I tried pressing and holding the button on the router for a while. Also standing close to the router to see if it’ll work but nothing happened. Does anyone have any other method I could try?