"What career will be the best at the age of 30?" "best" is a subjective word and you ultimately will be the judge of what is best for you. We can only give you

"What career will be the best at the age of 30?" "best" is a subjective word and you ultimately will be the judge of what is best for you. We can only give you some suggestions on how to find what you really want to do to grow your career. Now, you first need to take a step back and identify WHY you are not satisfied with your current job. The Why matters. In your case, the clue is in "help me grow". So looks like you don't just want to do a job that does the same mundane customer service day in and day out. Ok, so you have figured that part out already. A lot of people don't even get there. Make a list of your dream jobs. List at least 10 items. Write it down. Yes, it can be "dreamy" (read: unrealistic) but don't worry about that quite yet. Just make the list. I am sure you can come up with something. If you struggle to do even that, then think of people you may have met whose job you admire. Not just because of money but because of what they do. Make that list. Go through this list every day and keep checking if some items on this list are still worth paying attention to. Perhaps, you can cross out 1 or 2 from that list after a few days because you KNOW that this was just a whim and not really something you would love to do. Keep refining that list. As you do this, narrow the list down to 2-3 items max. Now, start thinking about the "realistic" part. The 'realistic" part should be determined based on what matters to you. Did you need something quick ? Perhaps becoming a doctor is then out of the picture. You know that to do that, you will need 4 years of undergrad, then med school and then another few years of professional education. At age of 30, if you start, you may take another 7-8 years which means you will be 38 when you can start practicing and not to mention that you may have a few hundred K of loan. Hmm, so if need something quicker, becoming a doctor is not realistic. Note that I am not saying it is impossible. It is just unrealistic for your needs. Use this tactic and I hope it gives you some ideas.