Is voting on the same authors time after time again the correct path to take for the platform to succeed in the long run?

No! Therefore I have suggested the idea of diminishing returns again: after each vote on a specific account (including ones own account) each further vote on the same account should lead to significantly less curation reward for the voter and less profit for the upvoted account. Thus, when upvoting an account which I had already upvoted before, my voting power would be smaller than in case I upvote an account which I didn't upvote before.