I'm doing exactly the same thing! I am leaving up my Vocal profile and publications and probably will keep cross-posting there, but Simily has been calling my name and I answered the call this morning. I'm going to see how some of my Medium-published work does over there, in terms of earnings and readership. The editing tool at Simily isn't quite as user-friendly as here on Medium, but a hundred times better than Vocal. See you there!