My first thought is eliminate some of the features of your package and make them ad ons. For example the basic hourly program contains these features and now these features are now extra.
Offer to continue the present prices to those who will pay for the services 3 months in advance, or 6 or 1 year.
You could keep the basic price the same but require a percentage of the profit it produces, a shared revenue model along with your old prices.
Offer to keep your prices the same if they will give you a free ad on their website, or include a flyer of yours with every bill that goes out to get you more business.
Trading services is a lot easier to get approved then increasing your hourly billing by 50% but with some of these ideas you may make more than 50% and everybody's happy. Call we can talk....Ken Queen