Counting Unique Goal Achievements?

Question

Google

Tell me how to solve the problem with conversions:
The site has goals implemented through visiting the "thank you" page.
The goals work all right, however, the user can submit the form several times, as a result of visiting the "thank you" page several times, but it is necessary that the goal of visiting the "thank you" page per user is counted only once, no matter how many applications he leaves
Who uses what solutions?

Answer 1

What if you set up the report like this?