The other transformative thing for me was moving to fibre to the home. The fibre to the cabinet in the area suffered massive contention issues (didn't matter who your provider was because they all used the same cabinets). In the old days when the copper cabinets reached capacity they would stop taking new subscribers, but in recent years they've just been wiring more and more people in and hoping not too many people would use it at once. Which of course they did when the working from home and home schooling started 2 years ago, leading to everyone in the area having multiple sometimes multi-hour internet outages a day, which was a complete nightmare. The recently-installed fibre to the home removes the contention issues, so when combined with the HomePlug/Powerline wired connections where-ever possible, everything has been rock solid. Only mentioning the fibre to the home as an example of where new technology does actually make things significantly better rather than worse.
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No mention of HomePlug/Powerline? Turns the power lines in your house into a wired LAN - plug one into your router and a mains wall socket and the other(s) into mains wall socket(s) in other room(s) to get you wired network connection(s) in that/those room(s). I've been happily using them for years, after struggling with WiFi in a large L-shaped loft-conversion that had a lot of lead cladding. Now everything that can be wired is wired, i.e. devices that are rarely moved, reserving WiFi for just the devices that need WiFi, i.e. devices that are often moved, e.g. mobile phones and the car outside.
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YMMV - I've never had any luck with Ethernet-over-power boxes, but it's very dependent on the quality and topology of house wiring.
Fibre to the home, on the other hand ... super amazing. Rock solid 1Gb full duplex (and for busy torrents I actually hit 120Mb/s!) ... but it's all about the latency: I have (according to mtr) <85ms with StdDev<1 from home in .NL to OVH in .QC.CA.
I bought a set of powerline network adapters once, from a reputable manufacturer. While they work flawlessly, they have an extremely annoying side effect that made me pop them out an hour after I first installed them. I ran an ethernet cable instead (now I'm using them again in a different place). They turn the powerlines into radio antennae and all my semi-professional studio headphones tend to pick that signal up as really distracting digital clicking and humming noise.
The newer G.hn powerline stuff is pretty great. I initially tried to run an ethernet cable from an AP in my second-floor office to the router in the basement, but it had to go through what used to be an exterior wall so it ended up being impossible (without making big holes which I wasn't willing to do). I tried Ethernet over coax but never got that to work either. Then I got a pair of G.hn adapters and they've fit the bill perfectly. Absolutely rock solid (literally had more issues with the fiber to the house), good speeds, etc. Anybody scared off by older powerline standards/implementations should give the newer ones a try.
I like the powerline plugs as well. I've been using them for years now, upgrading as speeds improved.
I also installed a mesh wifi network, but installed one that would do the backhaul to the router over ethernet (and powerline) rather than via an extra wifi channel.
Shameless plug?
Excellent choice.