I am a fan of https://www.riut.co.uk/

I use unfi but that’s an American company so not really fitting for these community and why I didn’t initially name them.

Have you tried https://fritz-kola.com/en ?

My (old) ISP provided a fritzbox, one of the best ISP provided routers I have ever used, but if you have the time and money they are better “prosumer” options out there.