Du you want a plastic box or a pc with your own os on it (like opnsense or Linux)? It anything in between? I would say the 2 ends are between a fritzbox and an AliExpress router PC.
Btw throw your repeater away in case you use it as a Wi-Fi extender. It cuts your wifi performance to 1/4. It only works if you use it with a cable as a separate access point.
If you also want to improve your wifi setup, I can recommend unifi. Aruba is also good but they went cloud only and who knows how long they will keep there old non cloud firmware updated.
Last Windows I activity used was 2000. After that I switched to Linux and never looked back. I hope Windows increases their shitification as hard as they can to finally drive people away from it. There are so little reasons nowadays to still use it. Apart from competitive gaming (in kernel anti cheat) and some proprietary apps that have no good alternative, Linux and macos should be able to support everyone's needs.