Good marketing has a long ramp-up time. Ideally you would have started your marketing program several months ago.

I think the most effective marketing communications is PR. You can find a solo PR agent to handle your account for about $1k/month. This is the low end of the PR profession, and you don't get world-class creativity. However, if done right it will earn you a trickle of mentions on tech websites.

PR is like boiling water. You have to apply heat for a long time.

See PG's essay on The Submarine.

No matter which marcom route you emphasize, you will be much stronger if you can clarify your market. Saying "anyone who could benefit from $product" is blurry.