Does anyone has insights about dealing with Spamhaus?

I'm getting increasingly frustrated by being listed without explanation. I run a very low bandwidth mail server and a website for my business. I am running postfix with SPF, DKIM, and DMARC. I'd like to know what I am missing.

Spamhaus is very popular which in turn affects Twitter, LInkedIn, beyond just the mail.

Is it possible to run one's own mail server this days?

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