Reposition your router
The first thing you can do is to simply relocate your router to a more central location. A router broadcasts Wi-Fi signals in very much the same way as a light bulb shines light across the room. In order to efficiently light the room up, you have to put the bulb in a central location. It is the same with routers.
Generally speaking, the router should be placed in the center of the area that you want Wi-Fi coverage. Additionally, try not to position it near any obstructions like walls, glass, mirrors, or any electronic or metallic objects. These can interfere with the Wi-Fi signal. Also, don’t put it on the floor. Instead, try to put it in an elevated position preferably on a desk, side table, or console table.