Out of nowhere I am getting ERR_CONNECTION_REFUSED and my site won't load

I have a LAMP stack on a DO droplet with Wordpress installed on it.

I was working with some plugins today related to social login and another one that requires email verification for new users. Everything was going great and then all of a sudden, I was getting this error: (Screenshot) https://app.box.com/s/cu9ag9pk7csoz3fynqev7ggja25beht6

I noticed that I’m able to access my site from my cell phone but I can’t access my site when i’m connected to my home wifi router.

I am able to SSH into my server, using my home wifi connection.

I also tried using a VPN on a home wifi router and was able to load my site! It makes me think that it has something to do with my ISP. But what would have changed all of a sudden… truly out of nowhere!? How could I tweak something where my ISP won’t let me access my site? Maybe it’s not the ISP though.

I’ve found a bunch of other articles where people were getting this error:

• https://www.digitalocean.com/community/questions/wordpress-site-experiencing-err_connection_refused
• https://www.digitalocean.com/community/questions/err_connection_refused-in-wordpress
• https://www.digitalocean.com/community/questions/out-of-the-blue-i-m-getting-err_connection_refused-when-i-try-to-reach-my-site
• https://www.digitalocean.com/community/questions/help-me-to-fix-err_connection_refused

Any ideas on what my issue is and/or how to fix it?