There were many Old Testament prophets, they did their purpose and many went on to displease and anger God. Just because you allowed God to use you for His purposes does not mean you have a free ticket to heaven.
Aren’t we ALL supposed to be letting HIM use us for His purpose? Isn’t that kind of the point?
The idea that God is going to treat believers differently with “secrets” or special grace is just not Biblical.
Showing respect to one person over another is sin, as per James.
We are ALL special to Him, none more than any other. He loves us all the same and does not show partiality.
Whatever He chooses to us us for, when we do it, we’ll hear, “Well done, good and faithful servant”.
What’s important is not WHAT we do as far as great things in the eyes of the world or not, but that we obey.
Whatsoever you do, whether you eat or drink, do all to the glory of God.