try asking the guys at the gym to write you up a new programme based on your short/ long term goals. set yourself a target and aim to achieve it over a certain amount of time (i.e if you like to run, sign up for a 10k. if you prefer cycling look into charity bike rides. or maybe even try aerobics, pilates, yoga, circuits, etc etc etc - the list of group classes is practically endless nowdays!!!!)
personal training is always an option but be prepared to work hard and pay up!
hope this helps, hit me back if you'd like more advice