Offloading an entire squad is very difficult (selling is notoriously hard) and is also disruptive to any new players arriving into an unsettled squad, making your chances of promotion lessen. Winning a few games on the bounce also generally see's a players unhapiness for things like wants a move to bigger club/unhappy at treatment by you etc go away, so you don't necessarily have to sell everyone to succeed. How many teams have sold an entire squad in real life and gone on to do well anyway?
Screenshot us your squad (press alt+f9 when on your squad page, then find the screenshot in my documents/Sports Interactive/FM12/screenshots) and we'll go from there.