What's a good budget SBC for routing and also a AP?

Hello. Looking to replace my current setup and am thinking about buying a SBC and AP. My current internet is spectrums 200/10 plan but might upgrade to 400/20 in the future. I have a single eero router ATM but will be moving into a bigger place soon. The main issue I'm having in fluctuating high ping and intermit lag on online multiplayer gaming, even with SQM enabled on the eero.