In cases like yours, the best solution is probably to get an x86-based fanless mini PC built around a laptop CPU. Those can hit quite high single-threaded speeds and have enough resources to handle not just your routing but also light duty as a home server. Chinese brands like Qotom and Topton and a bunch of others are selling them on AliExpress. They're several hundred dollars, but still cheaper than a lot of enterprise gear, and you can get them with 5 or 6 Ethernet interfaces. Getting a separate consumer WiFi access point/router with minimal CPU power of its own is usually cheaper than trying to add an AP-capable WiFi card to a mini PC.