You might make the mistake of thinking that living a life plan means you need a very specific career that directly matches your described purpose. This is highly unlikely.
Work—whether in or out of the home—is no different than anything else in your life plan. Whatever you do should be the fullest potential contribution to your overarching purpose. What you do is not the driving factor— why you do it is.
Many today—particularly young people—seem to think that a job worked only for the money it pays is some tragedy of unattained opportunity. The prime benefit of work outside the home is almost always what you get paid to do it. Though it is possible to find intrinsic meaning in what you do for a living, it is much more likely that the value of the money you earn is greater to you than the value of what you do, otherwise you would volunteer.
Having a life plan will help you feel the same way about whatever you do for money as you do what you do for purpose, because the one will directly feed the other in ways you have perceived and actively think about.
Working for money does not in any way preclude finding great meaning in your work. Very few transcendent purposes can be pursued without temporal means.
Few people find their purpose in their job, but most need the money their job provides in order to fund their purpose. If you find your job meaningless, it isn’t because you need a job with greater meaning, but because you have failed to honestly perceive the value of the money it provides.
When you recognize the value of money in terms of your transcendent purpose and know exactly what higher value outcomes it makes possible, it’s much easier to find deep meaning in work—even if the main benefit it provides is a paycheck.