Wifi Doesn T Reach Bedroom

It should have 3 bars of signal from the router, or at a minimum 2 bars.

Wifi Doesn T Reach Bedroom. Advised by help centre to try changing the channels, which makes no difference help chat just keeps saying to change the channel then end chat before i can explain it doesn't solve the issue. It should have 3 bars of signal from the router, or at a minimum 2 bars.

Located in Malibu, 1.6 miles from Pepperdine University ...
Located in Malibu, 1.6 miles from Pepperdine University ... from i.pinimg.com
I have a room in my house where the wifi connection doesn't stretch to. We have a home mini in my kid's bedroom, and it shows up as an open wifi hotspot on my computer. It works fine in the living room (where router is) and bedroom next door its ok in kitchen, but the bathroom and other however there are things that can be done to improve wifi reach to ther rooms.

Wifi doesn't reach my room upstairs anymore.

I tried to connect the wifi booster to upstairs because there's a broadband/telephone area that's on the middle landing but doesn't work on the middle floor and needs to be fixed. I am about to install a pc and stuff in that room so going to need wifi and hopefully ethernet. Internet is fine, but still can't connect to the wifi outside of the room it's in. Simply put, if you are getting a poor signal, or no signal at all, somewhere in your home due to signal interference, a wifi extender may not even help.