Development / revision / audit of the site

We are tutors. They made the site themselves and tried to promote it themselves - but to no avail. After that, the site was redone, and for advertising promotion they decided to contact a specialist.
Nevertheless, we received radically different assessments of our site from advertising specialists, and taking into account the past unsuccessful launch, we doubt its quality.
Heres our website: https://studylumus.ru
We need 10-12 customers for it.

Im not sure if its visible from the site, but we offer services of actually unparalleled quality, better than any tutors, courses, schools, etc. Of that, we are sure. They have a lot of experience, at first they worked in online schools, and personally on word of mouth. But here we are in a situation where we have a product, and what else, and we cannot sell it.

The essence of the order:
I would like to know the opinion on our site, how much it reflects our ideas. If you can improve it - write, if you need to redo, we are ready to discuss this option. If you think that a detailed audit will be enough for us to fix everything ourselves - also write.