Welcome to the Roku Community, @blosepo1!
Thanks for bringing this issue to our attention. We'd be more than happy to provide the information you need.
Since you lost the connection to your previous Wi-Fi network, you'll need to use the physical remote to connect to the new Wi-Fi. Unfortunately, you can't use the Roku Mobile app without the remote, as you must first manually link your Roku TV to the new internet provider. Once this connection is established, you'll be able to use the Roku app seamlessly.
We hope this clarifies everything. Please let us know if you need more help.
All the best,
Emman
Emmanuel-D.
Roku Community Moderator