If the Roku still sees other networks (such as the hotspot), just not your own, then the wireless radio is working correctly. So the issue is something changed on your router.
Most Roku devices only work on the 2.4 GHz radio band, with the Stick, Ultra, Express 4K+ and Soundbar as the only current models with dual band radios that also work on 5 GHz. If your ISP has control over your router, it's possible they have disabled your 2.4 GHz radio. No one knows why, but some ISPs have been doing just that. So you need to access your router config screen and confirm 2.4 GHz is enabled.
The next thing is what channel it's using. On the 2.4 GHz band, there are 14 available channels, but Roku devices only work on 1-11. Since your router is almost certainly set to auto-select its channel, it is possible the router has changed its channel to 12, 13 or 14. You might have other wireless devices that can see it, but your Roku can't. Your other devices might also work on 5 GHz, which would also explain why they can still connect. So the next step is to manually assign the channel. The best channel to use is 1, 6 or 11. Just pick one. But if you get interference from someone else's WiFi, then try one of the other two.
Dan
Roku Community Streaming Expert
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