Hey.. this is awesome, @abh12345! Thank you so much for doing this; I really appreciate it!!

To be perfectly frank, I don't think I could even pinpoint one reason why I have accumulated the curation scores I have: but there are a couple of things I could mention.

One, as others have said, is to try and pick posts that I think will do well in the future; i.e., posts that are, as we say, "undiscovered." One good way to do this is to go to the "new" category-tag, and the scroll-down to where the posts are around 15 minutes old; that way, you still have time to read the article and be sure it is of sufficient "quality" before upvoting it--but you are still "in" soon enough to be one of the post's early-voters. Then, depending on the situation, I will move to step 2 (see below).

Secondly: I believe we, as selfish humans, have a tendency to feel that "giving" is somewhat of an irrational act--especially when we feel that we ourselves are "in need--" While in fact, many studies have shown that cooperation tends to yield the greatest mutually beneficial results. In other words, instead of, for example, only re-steeming your own posts, how about re-steeming that really awesome, as-of-yet undiscovered newbie's post you just saw; or, maybe even buy the user a small bid on a bit-bot! gasp

Remember: Your curation rewards depend on you up-voting a post before it gets big; therefore, anything you can do to get a quality post you upvoted more exposure is a good thing!!!

P.s., And because I do feel that curation is such a crucial aspect of what makes Steemit great, you've got my witness vote, abh12345 :)