Does anyone know how to fix the problem with the Killer Wifi AX1650s on the XPS 15 9510?

It seems like I am having the same problem that many other people have described: the Wifi is just really slow. Not only are the max speeds terrible, it must be resending a lot of packets as pages take a very long time to start loading. It really makes the experience of browsing the internet (or downloading, or streaming) very frustrating.

There are a few pieces of advice in previous threads, such as this one, which seem to have worked for many people, but they're out of date: the versions of software it describes are no longer available (in fact the whole Killer site just redirects to Intel), and those steps didn't work for me.

The Wifi card is soldered to the motherboard so there is no replacing it.

Any advice or hints would be much appreciated!