Wireless Joint

I have been using a wg3526 with an MC7411 for over 8 months now. All of a sudden my wifi connection won't work and I can't figure out why. The sim card is able to get 4g connection when I put it in a phone. But it just doesn't seem to be working when I put it in the router. I am having a hard time figuring out how to troubleshoot this.

First thing to try is connecting to the router via ethernet cable and see if you can browse the internet that way