ur PC still need 3rd party antivirus installed? or the come in w windows defender is good enough??
How many PCs you have at home on your network? Handphone users? Do you have CCTV on your home network? Do you have IoT devices? Do you self-host eg. websites, personal cloud etc
Turn off UPnP on your router.
Make sure your router doesn't open any ports.
Put your CCTV and IoT devices on a separate vlan. Restrict their internet access.
Either enable adblockers and malicious site blockers on all devices like PC and handphones /. Or install Pihole/Unbound on a small raspberry pi to block these sites.
The above are the basic for most home networks.
If you self-host, then the threat matrix is very different.
Edit: do you have a NAS at home? Turn off remote access or any cloud access via QNAP , Synology etc etc. Likewise for CCTV. Access via Tailscale installed on the raspberry pi