Weak WiFi signal but I have two boosters

Hiya  This is my current reading on my doorbell. I have two Virgin media WiFi boosters between rooms to help the signal Yet, the rssi has not changed even by 1! I don't understand why it hasn't improved even by 1% and don't no what else I can do? I'm in a situation where the WiFi box is two rooms over in the bedroom but I cannot change where the connection for the WiFi is. With there's boosters it's supposed to help? Any idea what else I can do or if it's the doorbell itself?