Try OpenWRT if you want a good OS for routers. No need to change hardware.
I've just upgraded to an 8Gbit package (50 quid a month, rude not to). I'm having to use the provided router as my old one only has a 2.5Gbit port (still provides wifi however). I'd be keen to know of any fairly decent openwrt compatible routers with 10Gbit/wifi 7 at a reasonable price.
Yeah I was considering this actually, but then I realised that I really want a working LAN 100.0% of the time, so I'd only go tinker mode if I had a backup. So I was gonna be buying a router regardless.
Now I have a Ubiquiti one, it's antithetical to my DIY instincts but I think I'm OK with my router being one of the proprietary appliances in my life.
Plus now the wired section of my LAN is really fast.