I generally recommend the book Founding Sales (available for free online), but it's targeted at SaaS founders.

But you're actually doing something even more common: running a consulting business, and there's plenty of content on that for just that reason, so I would go find content on how to scale a consulting business, e.g. this seems like the start of a thread to pull on https://training.kalzumeus.com/newsletters/archive/consultin...

Relationships are the best resource for sales.

Because to solve someone's problems, they have to tell you their problems.

Or to put it another way, the thing you do is to solve the actual problems other people have. That's what you need to sell. You aren't selling the fact that you know how to use a hammer. You are selling the idea that you can build the right hammer for the job.

So sales is not "out reach." It is "what do you need?" and you will probably do better by optimizing for getting to that conversation, not through optimizing for low effort on your part.

Linked-in is best used for networking not push notification. Networking is about trust. Maybe you can't help with someone's problem but you know someone who can.

Finally, you can't sell desperately. Good luck.

Google these:

1) "inbound marketing"

2) The lean startup / MVP