android – Pixel 4a 5G security

I have a pixel 4a 5G with the latest updates ( Jan 5, 2021 security update and Dec 1, 2020 Google Play system update). what security measures should I take to ensure that I have maximum security on my device. In particular is there is a firewall app that I can get that will help monitor external connections from IPs to my device (and I can block suspicious IP addresses)?

On my older devices, I had Network Connections app, but this no longer works on the new Android 11.

I also have antivirus app, and regularly do scans (This includes system app scans as well).

I believe a combination of a firewall, antivirus and VPN should be sufficient, but I am open to more suggestions.

This is a non-rooted device.