Using existing network tools[1] to fine tune things like the domain name system (DNS,) email authentication, and routing may not be sexy work, but it makes a big difference to the effectiveness of your cybersecurity.
Failing to secure your DNS with DNSSEC is savage ignorance[2], according to Geoff Huston, chief scientist at the Asia-Pacific Network Information Centre (APNIC).
Huston calls BGP, the internet's fundamental routing protocol, a screaming car wreck[3] with "phenomenal insecurity". Ask your ISP whether they've secured their routing with RPKI-based BGP Origin Validation, for example, because too few regional operators are using it[4].
Finally, make sure your email domains are secured against spam and address spoofing with SPF, DKIM, and DMARC.