You are a Type 3 with a 4 wing: "The Professional"
Your trifix is 3w4, 6w7, 8w9.
In enneagram theory, you have one type for how you relate to the world (either 8, 9, or 1), one type for how you think (5, 6, 7) and one type for how you see yourself (2, 3, 4.) Your tri-fix contains one number from each of these triads. They are listed in the order of how strongly they present in your personality.
Your core type (your strongest type) is Type 3 with a 4 wing: Type Three individuals are self-assured, confident, and driven for success. Type Threes have a great deal of energy that propels them to excel at their chosen field, and this is why the type is often called The Achiever. Although Threes may not always like it, they’re often looked up to. Type Threes, more than any other type, are the most likely to be a workaholic. When in a state of growth, Threes become more cooperative and trusting of others, like a Type Six. When stressed, Threes become withdrawn like a Type Nine. You are a Type Three with a Four wing, which means that your energetic nature is tempered by a Four tendency to withdraw, which gives you a sense of calm that others often lack.
Your second type (your next strongest type) is Type 6 with a 7 wing: Type Six individuals are reliable, committed, and security-oriented. They are natural troubleshooters, and are always aware of potential problems. This makes the Type Six anxious, but the anxiety fuels them to resolve their problems. They can range from loyal to rebellious, depending on where they get their security from – if the security is from within, they can be very defiant… if it comes from others, they can be very cooperative and devoted. When a Type Six is in a growth state, they become calm like a Type Nine. When they are stressed, they can become arrogant like an unhealthy Type Three. You are a Type Six with a Seven wing, which means that the committed nature of the Six combines with the outgoing nature of the Seven to create a very engaging personality.
Your third type (the least-used of the three) is Type 8 with a 9 wing: Eights are assertive, dominant individuals who naturally take control of situations. Eights are aggressive in satisfying their needs, and indeed, Type Eight is the most aggressive personality type in the Enneagram. When in a state of growth, Eights become like Type Twos - caring and protective of other people. When Eights are stressed, they become withdrawn and secretive like Type Fives. You're an Eight with a Nine wing, which means that the calm nature of Type Nine combines with the assertive nature of Type Eight to create an individual who uses their power justly and often doesn't make the first attack... but if someone else does, they'll finish it.
Some words that describe you: decisive, authoritative, natural leader, assertive, ambitious, driven, adaptable, energetic, loyal, reliable, anxious, skeptical.
EDIT: I feel like this is sortof a horoscope level of valid science but it's definitely better than an MBTI test at describing my outlooks