How to grow a startup that has paying customers (accelerators, online programs, coaching or something else)?

I have a startup (https://nutritioapp.com) - it is a SaaS for nutrition professionals. We are 2 co-founders and we bootstrapped it to this point. We've focused a lot on building the product and improving it. We have right now about 40 paying customers.
We would like to grow exponentially in the next 6 months.
We have a product that we are proud of and we would like to move to the marketing/sales part.

We have some very specific needs right now and I would like to get your expert opinion.

Our needs right now are these:

1. Site - how to adapt the messages on the website so that it would convert more qualified visitors into trial users
2. How to increase the conversion between trial users into paying customers
3. Selling script - how to close the deals when we are doing presentation/demo calls (we do about 2-5 calls per week)
4. Marketing - how to choose the best marketing strategy and implement it (we believe content marketing is the winning strategy, we just need to validate it)
5. Maybe some pricing strategy

For most of these points we know what to do, we are just not very confident that we are going to do the right job since we are at our first startup that has traction.

I found this program https://www.danmartell.com/growth-accelerator and it seems to cover most of what we need, there are 2 problems:

1. It's pretty expensive (about $2500)
2. It doesn't actually offer 1on1 coaching, just 4 group calls and a lot of recorded videos.

What is your opinion regarding our needs and what would be your approach? Would you use a program like Dan Martell's or would you try to implement everything yourself as well as you can? If you would use a program/coaching could you share suggestions?

Thank you very much for your feedback.