leave (one's) options open
To refrain from making a decision or commitment that will limit one's choices in the future. You're awfully young to be getting married. I just think you should leave your options open until you're finished with college. They've offered me a good salary if I stay with the company, but I think I'd like to leave my options open for now.
keep/leave (all) your ˈoptions open
avoid making a decision now so that you still have a choice in the future: Doing business with him is sometimes quite stressful. He likes to keep all his options open until the very last minute.