Well for Bluetooth you can do ***select Start > Settings > Devices > Bluetooth & other devices > Add Bluetooth or other device > Bluetooth.*** Choose the device and follow additional instructions if they appear, then select Done.
And if this not working than check for the outdated driver as well because some time an [link|https://www.systweak.com/advanced-driver-updater|outdated driver|new_window=true] can also cause these kind of issue in you system.
And for wifi related issue you should check out this it will be very helpful for you: https://support.microsoft.com/en-us/windows/fix-wi-fi-connection-issues-in-windows-9424a1f7-6a3b-65a6-4d78-7f07eee84d2c