You should socialize a lot with writers, especially writers who like the same books as you. Updating frequently will also help get you on the What’s New section too. Don’t advertise your book to someone who you don’t know though because it can get on people’s nerves. Thanking people for reading/voting/following you will also help make a good impression on them too. You should also be prepared to wait since getting popular on wattpad takes a lot of time and effort. Hope this helps