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Change which band channel thing the network is on to one that's empty.
Might need something like this to work that out as you need to figure what the other neighbours are on, lots of routers default is channel 1.
https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer
Most routers antennas work in pairs with one as up and the other down, mismatching them your computer is picking this best but it's not really able to do that up+down.
Edit - also did you upgrade your end? If he is shouting and you are whispering that helps...
I use my neighbour's wi-fi (with their permission) and he's just fitted a directional antenna for my benefit.
The RSSI is now around -59 compared with -72 previously and Windows reports a speed of 150/180/270Mbps, up from something like 50Mbps before.
And yet pages are much slower to load, everything is slower. I've also done a speed test and up is faster than down: 2.35/4.92Mbps.
How can this be and what can be done about it?