My dude, by your own admission you don’t even have access to your own router, one of the main steps and requirements in troubleshooting and resolving remote access issues. No one has a magic fix for you. It’s likely that in getting a new device, it got a new internal IP and now you need to fix the port forward. At the very minimum, you need to figure out how to access your router so you can at least check the settings. It is a primary component in remote access setup and troubleshooting.
Once you do gain access, there’s multiple articles and guides that will hopefully help resolve things:
Remote Access and Troubleshooting Remote Access support pages.
And this guide: The Basics of Remote Access Troubleshooting
For local access issues: do you have another device that you can use that has a browser (phone, tablet etc.)?
