• User rank: which depends on your delegated HP, accumulated AFIT tokens, rewarded post count, recent rewarded activity and owned AFITX.
• Post score: which depends on your activity count, post content, post upvotes, quality comments, moderator review and user rank.

To improve your user rank, delegate more, pile up more AFIT and AFITX tokens, and post more.
To improve your post score, get to the max activity count, work on improving your post content, improve your user rank, engage with the community to get more upvotes and quality comments.