After the audit, it became clear that the problem lies in two things:
Strongly aggressive scaling.
The sharp jumps in budget from $10 to $100 a day led to a lot of defocus on Facebook's search for new leads. Because its goal was to give the maximum number of applications for the given budget, it wasn't looking for quality leads, it was just showing ads to everyone it could.
The price for the result flew from $2 to $4+
In this case, we had to use two ways of scaling:
gradually raise the budget of already successful Ads Campaigns
Add new ads, but always with a new audience or with different banners