If you still have many upvotes it means your posts are valued by the community. Also the best indicator of a quality post imo is the number of comments ( interest)
200$-300$ per post is hugely overvalued, when/if steem has millions of active users the highest you could expect is maybe 10$ per post but you would probably only get a few dollar on average. If you look at some popular profil like dollarvigilante or stelabelle they also had a decrease in reward, because the whales are doing the right thing which is to diversify payout, if they keep upvoting the same people you have 90% of people that are not coming back, that's exactly what is happening when you look at the stats.