Therefore, it is not surprising to see that the first merit can be easily given to a beginner, thereby being the first in the generosity competition.
But of course, it's just motivation, I understand.

This is nonsense and an attempt to connect two facts that have nothing to do with each other. Merit for newbies affect the generosity rating in the same way as the number of merits affects the activity counter. That is, no way.
Generosity is calculated using a different formula and the number of newbies you gave the first merit is not included in this formula. Seek help from Coin-1, he will tell you all the details for the future.