I also wanted a better wi-fi coverage throughout my place. I have tried them wifi extenders, the plug-in ones to outlets supposedly using the electric powerlines within the walls...etc...etc but none of them really worked until a year or so I heard of this wifi mesh network systems (whole home wifi systems). Check out the link below for a much better explanation.
These wifi mesh systems are more pricey but they work great. Usually they come in 2 or more. There are few brands out there but I chose
eero (now owned by Amazon). I will say once you install one of these mesh systems in house your "mancave" will get good internet signal.
If you have a large home or one with an unusual layout, you probably encounter Wi-Fi dead zones and could use a mesh-router system.
www.tomsguide.com
Article about best wi-fi mesh network systems below.
Working from home by day, gaming and streaming by night? Defeating Wi-Fi dead zones is more important than ever. A mesh network system can help, and these are the best we've tested.
www.pcmag.com