WiFi hotspot(?)

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Hey guys! I tried doing some stuff on cmd, but I didn't get it to work so I thought I'd ask for some guidance here, even though the rules say not to (badass). So in the drawing with incorrect dimensions, I tried showing you where I want my WiFi to reach. So the thing is that in the blue circle, that's where my neighbours WiFi reaches (he let me use it), and there the signal stops. And what I want is for it to reach all the way to my bedroom, in the green circle. So I thought that maybe I could use my PC that's connected to the WiFi as sort of a router(?) to make the signal go further, making it reach the green circle, my bedroom. I tried out the tips about writing this "NETSH WLAN set hostednetwork mode=allow ssid=Your_SSID key=Your_Passphrase" (changing out the ssid and password ofc), and it works, I can connect my PC in the bedroom to the PC in the blue circle, but it won't get any internet connection. In the post below I will post a picture showing what comes up. I was wondering if anyone here has got any pointers to what I am doing wrong? I appreciate all help, and I'm a total noob in computer-related things, so please talk English. Thanks!

PS. Yes, I do have 2 PCs, one in the blue circle and one in the green.