Subscription plan should be improved

Hi,
This is a must need option for good revenue system. kindly note a subscription based model is needed for a continuous revenue system what right now we have is just purchase a package & it will be there forever this module will not bring a rotative revenue. So the subscription module should be monthly, 3- months, 6 - months & a Year plan. once the plan expire it should go to the default 1 month free pack. So the users will be able to post job & buy subscription & the revenue module would be a continue grow & purchase from existing client itself.