This is a hard question to answer. Since you believe in reincarnation, then you probably experience situations where you meet certain people and feel like you knew then all your life--because you have,
just in other lives. We have known most of the people we are close to now in other lives, and feel the "pull" toward them. Except we will be in a different role now. I think I was my late husband's father in one life. Long story.
Do people often tell you that you are an "old soul?" Or that you are mature for your age? Are you able to empathize with mostly all people and not judge them, because you probably walked in similar shoes at one time? Are you very fair and open minded, patient and kind to others? These are all signs you have lived many lives, as they are characteristics that take much time and patience to evolve into being.
I believe too. I've read so much on reincarnation and retrieved part of my Akashic record, through meditation and working on it. Sometimes if you have an affinity for a certain country or profession, it's because of what you did in a past life. I have a friend who traveled to Japan once and got so interested in karate he devoted his whole life to teaching it in a traditional way, along with the culture and language. Clearly, he lived in Japan for a few lives. Also, the later Astrology signs show more highly evolved people, Pisces being the most so.
But I never found a way to know what exact stage we are in. The traits I mention mean a person who is farther along the stages than most. But time is not linear. I think I lived in ancient Egypt too and was in Atlantis before I went there (with my late husband). So you had lives centuries ago. Think about your interests and hobbies, that may give you clues about lives too. So will your dreams if you can remember them. If you know a good psychic who is real, they can "see" more. But as far as telling WHEN we are on the final stage, I think we won't know until we pass away the last time and live in the Spirit world. And even then we can choose to come back to the material world to guide others.