There are a variety of successful open-source firewalls, like pfSense software, OPNSense, IPFire, etc. They are quite stable firewall solutions and have a handful of features, commercial-grade performance, timely updates, and great community support.
You may find more information about open-source firewalls in the Best Open-Source Firewall article written by Sunny Valley Networks.
It is achievable to build the best next-generation firewall (NGFW) for home use combining an open-source firewall, a fanless mini PC, and a packet inspection module.
In this tutorial, we'll describe how to create a next-generation firewall (NGFW) to protect a home network with a few hundred dollars.
How to Build your Own Next-Generation Firewall (NGFW) at Home? - zenarmor.com
How to Build NGFW for Home
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