Congratulations on the 1500 mark. I congratulate you mainly because you believe it is so important. I know it is. It was to me too. I was in the same trail as you . I celebrated my 1000 (in 101 day), then 2000 (in almost a similar time period). Then I stoped. Because somehow I realised that only the quality, content of those milestones is what matters, not the quantity alone. Especialy my view changed after I find a site (http://steemit.deadfollowers.info) which evaluates how many of your followers are "dead". After realised that qty of followers keeps growing even I stopped all my posting for two weeks. After I have seen how -2000 upvotes on a post (not mine) can bring less then $0.03 in post rewards. Thinks start look different once you dig into them deeper. To me my 500 mark seemed a lot more important than my 3000 milestone. I have seen accounts with 20000+ followers on the list, while they are following themselves more than 100000 users. And it does not seem any magic any more to me. The bold qty of followers is not what really matters. Steemit platform needs so many changes and improvements to be done.