You can automate some of it, but it's good to start manually and learn the ropes first.
You need to understand who your ideal customer is and what channels are they on.
Linkedin is a common one for b2b sales.
If you make 200 connections on linkedin every week and send them a message, some % of that will convert to meetings and sales (the exact % depends on your audience, message, and how urgent the pain you're solving is)
It is extremely hard at start, especially for engineer types (like myself)
Fortunately, it's a skill like any other that can be learned.
Read this article for more info https://x.com/namanyayg/status/2097783972302557668?s=46