So it sounds like: you're a contractor (i.e. you are part of the most disposable group of people in the building), you have a fixed duration of work (presumably

So it sounds like: you're a contractor (i.e. you are part of the most disposable group of people in the building), you have a fixed duration of work (presumably with an option to extend... but that's not a unidirectional option), as a group the contractors scope of work has been altered (from strategic to tactical), and your contract is almost up. If this isn't what you signed up for and have other options, provide the customer of your intent to end the engagement when you have satisfied the term of the contract at 6 months (don't do it early, just give whatever notice is needed so you can end it on time). Don't assume that anyone there cares about your ideas on how to fix things or they would have asked you already. One big caveat: if you're going through a 3rd party contracting company I've got some bad news for you... you probably never were there for the strategic work but rather to be a warm body to sit there and be billable so just put in your notice and move on. Worst case, you get offered more money to keep putting up with it (make sure it's a real increase... I'd go for at least 15-25%)... and if that appeals to you, enjoy some easy money riding it out for a bit longer.