If your Roku device isn't connecting to your wireless network, there are a few things you can try to fix the issue.
First, make sure that the Roku and your router are close to each other. If they're too far apart, the signal may not be strong enough for a connection.
Next, check to see if there's anything blocking the signal between the Roku and router. This includes walls, furniture, or any other obstacles.
If you're still having trouble connecting, try restarting both the Roku and your router. Sometimes this can clear up any issues that were preventing a connection.
Finally, if none of these solutions work, it's possible that there's an issue with your wireless network itself. You can try contacting your ISP for help troubleshooting the problem.