I remember interviewing at a Fortune 500 company years ago when they asked the classic question: "What is your biggest weakness?" As a career coach, I've thought a lot about that question — because I work with mid-level professionals who want to advance, and I've seen what actually holds people back. It's rarely what they expect.

We tend to define our weaknesses as skills we need to improve or personality flaws we need to overcome. The reality is, most people can take a class to improve a skill, and most have found ways to compensate for their personality quirks. What we don't often examine — and what really holds careers back — are our behavioral patterns: the recurring ways we act or react in given situations.

I had a client who was a mid-level manager at a large company, working hard to move up. He'd taken classes to improve his skills and had learned to manage his perfectionism. But he hadn't examined his behavioral patterns. Through our work together, we discovered that he consistently backed down in any situation he perceived as confrontational. He'd built a reputation for being agreeable — but his supervisor's feedback revealed that his silence was reading as an inability to make difficult decisions or advocate for his team. That pattern was costing him the advancement he'd been working toward.

By identifying and modifying those patterns, he was able to shift how he showed up at work — and his career moved forward. If you're looking to advance yours, here are three mindsets that make behavioral change possible:

Mindset 1: You Can't Do This Alone

How we perceive ourselves is often very different from how others perceive us. That gap is where a skilled coach or therapist is invaluable — they can reflect back what you can't see yourself, and use techniques like mirroring exercises to help you understand your patterns. Think of it as an investment in your own development. The most effective leaders in the world have coaches.

Mindset 2: You Have to Get Uncomfortable

Changing a behavioral pattern means doing something differently — and different feels uncomfortable at first. Whether it's speaking up in a meeting where you'd normally stay quiet, or delegating instead of doing everything yourself, the discomfort is part of the process. Expect it, and keep going anyway. The discomfort shrinks over time as the new behavior becomes more natural.

Mindset 3: Change Takes Time

Behavioral patterns are often deeply ingrained. You won't change them in a week. But with consistent attention, support, and practice, they do shift — and when they do, the effect on your career can be significant. Be patient with yourself, track your progress, and recognize the small wins along the way.

The work of understanding your behavioral patterns isn't easy. But it's some of the most rewarding career work you can do — because the changes you make ripple into every role, every team, and every opportunity that follows.