Bring your devices closer together at least until you get them paired. BT doesn't have great range. There are covid tracing schemes which figure if you got within BT range you're in danger. 20 feet or so should be OK. Also heavy WiFi use disrupts it since they're both in the same frequency band.
A device may be discoverable only when it's first turned on but there has to be a way. My ear buds have one button each and the LEDs flash differently: red and blue instead of just red. It's easiest to start with them all within reach until they're set up. Playing sound my ear buds aren't 100% reliable 20 feet away. At one job a receptionist had a BT headset, they worked within that room, not beyond. A niece had a BT headset for hands-free driving on her cell phone, mostly didn't work outside her car.
With my ear buds a long press on the one button powers them on and makes them discoverable for about 1 minute.