Really entirely depends on the product / service / industry. Without specifics, we can only give you broad answers. You could always pay for a list from a site like https://www.dataaxleusa.com/
i was hesitating to answer because i did not know what was the product - now i know.
it looks like a niche product for developer community.
what i would try:
* write content around how to create web form in different language + add to each article reason why they should use your saas instead
* create a youtube video that would show how to use the product, focus on researched keywords, e.g. how to make a secured web form
* join slack and facebook group communities
* try to promote your tool on producthunt, not because of the sales - but to gather the feedback
* there are many great products out there and some of them have better product market fit + marketing = what i want to say it is more like a marathon than a sprint
