Sometimes it's not about a 'specific career path'. Look outside of 'career' when considering what things an INFP can offer the world. I personally think that many INTP's and INFP's have a gift for teaching, instructing, informing, offering fresh insight and perspective into the problems/situation of life - and insight/perspective into life itself. When I mention these things - like teaching for instance - I don't "necessarily" mean in a classroom or even in a group setting. Think about the 1-on-1 discussions you have with your friends and family members. Undoubtedly, without even realizing it, you have offered them very helpful insights and perspectives throughout your relationships with them - you have
taught them. Because of the curious nature of INxP's - always questioning, always digging, always turning over the next rock to see what might be underneath it, always observing, always considering, contemplating, pondering, etc, we are many times able to offer a unique perspective that many others would not have considered.
Think about ESxx types - they love being part of the "action" of life. It's been my experience that they can teach us many things about being practical and productive, and even about interacting with people. But, it's also been my experience that we can teach them by offering our unique perspective, things that they may have never even considered before. We are the ones standing back, away from the action and observing. That approach to life automatically gives a different perspective, a different world-view if you will, from the person who is action oriented. So, we can help them, they can help us. I think INTP's can teach, instruct, inform, and offer insight/perspective to others in regards to "things", "stuff", systems, how to think through problems, etc. But, INFP's can do all those same things as it pertains to people, humanity, compassion, forgiveness (!!), etc. The non-logic side of things. While the INTP is more geared toward justice and truth, the INFP is more geared towards mercy and the subjective side of life. Both have their place. To embrace one and reject the other would be to sacrifice something. Both viewpoints are necessary in this world.
By understanding who you are and what traits you possess that are unique to this world, only then can you begin to look at careers that will enable you to use those traits. What career will enable you (or give you an avenue) to teach, instruct, inform, offer insight, offer perspective, etc? Writers are able to do those things through their writing. Counselors are able to do those things. Therapists. Speakers. Aquarium/shark tank tour guides can teach, educate, and inform people about the shark kingdom. These are all very real, practical, and tangible careers. People do these things every day and you too have access to these careers. Also remember, however, that your career - no matter which one you choose - will never FULLY encompass who you are. When you go home on the weekends or when you are with friends and family and even encounters with strangers - you are still able to teach, instruct, offer insight/perspective, etc.
Purpose = 24/7/365
Career = 9-to-5 or some other limited amount of hours.
Try to line up career with purpose so that they blend in nicely with who you are and what you enjoy doing.