Ipadand a iphoneAo3s

my wi-fi won't work in my bedroom. It did but it stopped.

Wi-Fi uses radio-like signals, which can suffer from interference. Distance to the Wi-Fi access point, walls and floors, electrical wiring, metal objects in between, and neighboring networks can negatively impact connectivity.

Try restarting the router or other Wi-Fi access point device. When it starts up again, many consumer models can detect on what channels neighboring networks are, and choose different (presumably optimal) channels (frequencies) for your home network, so that it experiences less interference.

Also see: discussions.apple.com/thread/253532264.

someone say it I had my low data on if I do I don't know how to fix it

See here for where Low Data settings can be found on iPhone and iPad, if applicable. Use Low Data Mode on your iPhone and iPad - Apple Support

Does Wi-Fi work better in other rooms? Does Wi-Fi drop when walking to the room without connectivity? Can you find a transition location?