@WarmPoet-
The reason asked for your Roku model number is that some more basic Roku models only work in the 2.4 GHz wifi band, while most others work in both 2.4 and 5 GHz wifi bands. Knowing your Roku model can help in narrowing down suggestions that apply to your particular Roku model.
Likewise, there are some problems that can be caused to ill-advised router updates, especially from a few known internet providers. If you tell us your internet provider, it can help determine if this might be the cause of your problem.
Lacking both these pieces of information, I'm going to take a guess.
Your problem may have been caused by an update to your router which affects some Roku models. If you receive this update it changes the router's wifi connection parameters for the 2.4 GHz wifi band from b/g/n to g/n. This has been reported for routers supplied by Comcast/xFinity, Cox, and AT&T, but there may be others.
Affected users report the Roku identifies the local network as available and rates the connection quality, but will not then connect. The fix is to switch the router configuration protocols from the g/n wifi set by the update back to b/g/n.
Thanks to forum user @AvsGunnar for providing the links below to instructions for reconfiguring router settings for the listed internet suppliers. If you can't do this yourself, you may need to contact your internet provider to make these changes for you:
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
