Hi, OP;
Perhaps you have not explained yourself well, which you should do well since it seems that you are a coach, I see it in your email, I am a poker player and anything for me is information

I ask you; If I send you a history of hands you can give me advice, what initial amount is good for you, 100 hands, 1000, a million, etc.
What do you specialize in, tournaments, sitç&go, cash tables, what variants, what betting limits do you handle...
On the other hand, it must be said that these services exist, in fact professionals use them, and it is very feasible that if you have the contacts or are in the right place, you may find a recognized professional, and then they can make an evaluation of your your hand history and tell you where to improve.
In fact some coaches go tell you what type of mouse to use, what type of chair, diet, exercises, software, etc.
Let OP play his hand to the river, no bluff please.
As I was saying in the previous post, I am a part time poker player. I play mostly CG at 10NL and 25NL. This post was not about coaching (even though, I do coach a little). To answer one of your questions 50 000hh is a good start to analyze one game properly.
But through this post I am just offering a few poker courses for a very cheap price.
And yes, you are right, you have coaches for different areas of the game.