If you already have accounts with bookmakers you won’t be able to complete their sign up offer, however, that does not mean those accounts can be profitable.
First, complete all of the sign up offers for the bookmakers that you don’t have accounts with, then use all of your accounts to complete the reload offers (offers for existing customers) that are available on a daily basis.
Remember, the sign ups are just the beginning, there is constant monthly profit to be made with the ongoing reload offers and over time, this is where the bulk of your profit will come from.