Your questions have been answered by pretty much every startup book going, but try "Running Lean" for a quick read that covers most of it.
Here's some quick advice, but tbh you could write a book answering this question. I suppose the general point of this answer is _you're asking the wrong question_.
Firstly: the mistake nerds make is asking "Can I Build it?" rather than "Will they buy it?"
There is a distinct difference between a _business_ and a _side project_. Nerds enjoy and are great at building side projects. Building a business is much much more than that. It's much more difficult. It requires a range of skills. And absolutely crucially, the software is _part of the business_ rather than the business being an "add on" to the software.
Writing software is almost never the difficult part of the business.
You should have a business model canvas describing your business. If you don't have one, create one (or more) to match your different models. You can knock one out in 15 minutes.
Now you have the canvas in front of you, you know exactly what you think the problem is and who you think your potential customers are. Great. Now you can go gather information that tests those hypotheses. No problem if you're wrong - you'll just need to adjust your hypotheses and try again.
How many of those potential customers have you spoken to and formally interviewed? I can guess it's none or very few, because those interviewees become your customers and you're having trouble getting customers. It should almost never be a "release the product on the world and sell it", but "build a product with users / potential customers". Most of us are not Steve Jobs or Apple.
Go back to basics. What are the three main painpoints you're fixing? What is the problem they have? Now speak to a CEO. Ask them what their biggest painpoints are. Mention excel, as them if they use it. Talk about it. See if they raise those painpoints. If they don't, you're off the mark. Find out what they _do_ care about. Be open minded to the idea of having to change your product.
Diving into specifics about copywriting or marketing strategies is pointless if you haven't gotten the fundamental right, that is: "make something people want" as some incubator likes to say.
Here's some quick advice, but tbh you could write a book answering this question. I suppose the general point of this answer is _you're asking the wrong question_.
Firstly: the mistake nerds make is asking "Can I Build it?" rather than "Will they buy it?"
There is a distinct difference between a _business_ and a _side project_. Nerds enjoy and are great at building side projects. Building a business is much much more than that. It's much more difficult. It requires a range of skills. And absolutely crucially, the software is _part of the business_ rather than the business being an "add on" to the software.
Writing software is almost never the difficult part of the business.
You should have a business model canvas describing your business. If you don't have one, create one (or more) to match your different models. You can knock one out in 15 minutes.
Now you have the canvas in front of you, you know exactly what you think the problem is and who you think your potential customers are. Great. Now you can go gather information that tests those hypotheses. No problem if you're wrong - you'll just need to adjust your hypotheses and try again.
How many of those potential customers have you spoken to and formally interviewed? I can guess it's none or very few, because those interviewees become your customers and you're having trouble getting customers. It should almost never be a "release the product on the world and sell it", but "build a product with users / potential customers". Most of us are not Steve Jobs or Apple.
Go back to basics. What are the three main painpoints you're fixing? What is the problem they have? Now speak to a CEO. Ask them what their biggest painpoints are. Mention excel, as them if they use it. Talk about it. See if they raise those painpoints. If they don't, you're off the mark. Find out what they _do_ care about. Be open minded to the idea of having to change your product.
Diving into specifics about copywriting or marketing strategies is pointless if you haven't gotten the fundamental right, that is: "make something people want" as some incubator likes to say.