Good question. Do you mean your trufflepig ranking or getting more votes in general? The former is not so easy to answer, but a good idea is to look for well-paid posts in @trufflepig's training data (check out his weekly post were he lists the time range of his training) and try to understand and follow their style and topics. Likewise if you check-out his daily top-list about posts that achieve a high payouts without using bots and self-votes may be helpful. This can give a good guidance since he considers these as quality content and tries to derive features from these.

Unfortunately, for improving your payouts, I guess currently the answer is by using bid bots and promoting your posts with vote selling services. In the long run you increase your payouts, however, by regularly posting quality content and gathering a loyal follower base.