The reputation score on Steem blockchain is dependent to total "Rshares" (Reward shares) you receive via upvotes and total Rshares you receive via downvotes on your posts or comments.
Here's an article with more thorough explanation about Rshares: https://steemit.com/steemdev/@jfollas/write-a-steemit-web-app-part-13-how-to-calculate-a-vote-s-rshares
To put it simply, consistent engagement within the blockchain doesn't affect your reputation score, only upvotes and downvotes do. Also, reputation score on Steem blockchain is a logarithmic function. What does that mean? It means that it's 10 times harder to increase your reputation score compared to the previous increase and that also applies to decreasing reputation score. So basically:
Your reputation score as I am writing this is 51 which is a relatively high one. You don't need to worry about it as it's completely normal as that's the way reputation score works on Steem.
