I agree with everyone above. If you think there isn't much to learn flying a C152, you haven't been doing it long enough yet. I'll give you a little secret about making people take you seriously at 500 hours. Be where you are. You are a flight instructor. You need to be a flight instructor. There's nothing that makes people check out on you faster than you telling them you're only here to put in your time and get out. Sure, they may ask you what you aspire to do. Most people know that instruction isn't your last stop. You don't need to remind them of that. Instruction is all what you make of it. I GUARANTEE that if you focus on being the best instructor you can be, and put out of your mind as best you can the thoughts about moving on, you'll get a lot more respect. At 500 hours, you have reached a level that many GA pilots never reach. The FAA says you have the knowledge level to teach people with no prior experience how to fly an airplane. That's a huge responsibility, and when you realize how big that experience can be, you'll be happier. You don't have to love instructing. You just have to be where you are. You'll get to the regionals before you know it. At 100 hours per month, you'll have the minimums for most places in 6 months. That's not a long time.