You need to get a clear view of your potential buyer

There has been quite some discussion on the fact that its good to have an audience before you start bootstrapping, it helps, having a relation with someone helps to create confidence in your project and it will be more easy to sell. But let us be clear: You don't need an audience to start, but you need to know your buyer.

Let me take you into some marketing basics

You need to know who you will be selling to, you can make this into a big exercise and define "buyer personas", but in essence,
think about who your ideal customer will be. What is his/her profession, role in the company, what are his/her preferences, where do you think you can reach that person, Linkedin, Facebook, Reddit?

If you make a product that you would use yourself, you might think this is easy, and it is indeed more easy, but you can wonder how many people are just like you.

So you might say, i will just build my product/service, do some SEO and the people will come, i don't need all this marketing stuff, in don't plan to do payed campaigns.
Knowing your customer will help you make a better product, will allow you to make better converting landing pages and will give you faster traction.
Its the reason why startup growth is not linear , the more you learn, the better you get, the faster you grow.

Knowing your customer is the first corner stone of "product market fit" and in an ideal scenario you try to discover as much as possible about your potential buyer before you start building.

Think about it, if you make a tool for priests, you need to make a plan (in advance) on how to get into contact with them that makes economic sense.
Will you visit all churches in your country? it could be an option. But how will you convince the priest that your solution fixes his problem ?
What are convincing arguments ?

Your next step can be to create a landing page, describe your offering and see if people leave their details for more information. Once you have their details, reach out and try to start a conversation. This is not about convincing people , its about listening to their problems and learn.
Good luck