What are the advancement/growth opportunities of being a lawyer?
I love working with people with the intent of helping them through something. I'm also very passionate about the things I believe in, so that would be why I'm interested in being a lawyer. However, I prefer to always have an objective to reach and doing the exact same thing everyday wouldn't satisfy me. #lawyer
Some parts of the law can be very routine and repetitive - but even then you can find variety within the routine (e.g., each patent an Intellectual Property lawyer files is unique, even if the patent filing process is routine; each case a judge hears follows the same procedural rules, but facts & witness, are very different each time). I suspect "doing the exact same thing" depends greatly on how you choose to look at things!
Also, how you wish to help "people" will drive your advancement/growth: do you want to help children and spouses in family law practice with things like divorces, custody matters; do you want to help small - or large! - businesses succeed and expand in business or corporate law; do you want to help tenants - or landlords - in Real Estate law? There are so many different "people" (including companies, who under the law are considered people) to help and so many different areas of the law you can practice. And you don't need to answer once and for all - you can start your legal practice is one area, then change up and evolve as your interest/experience leads you to different paths. Sometime that requires a leap of faith - do you open your own law firm (you advance quickly when you're the boss!)? do you change law firms? do you go into the government? do you move in-house to a company who will be your only client? There are lots of opportunities if you are willing to work hard and learn new skills/areas of the law. And there are a wide variety of places in which you can practice law and which will effect the advancement path -- Jenna's answer is great on this point, so please do read that!!
Like any career, the more success you have, the more traditional options will be open to you. But your definition of "growth" may also evolve -- whether that's winning high profile litigation, closing big deal, patenting a life-saving medicine, reuniting a parent and child, or securing a visa for an immigrant.
Jenna's answer is great advice. I would only add that one of the ways to ensure you work in different areas of the law throughout your career is to be a litigator or appellate attorney in a mid to large size firm. Transactional attorneys work with new facts in each case, but tend to work in one area of the law, becoming experts in that area. Litigators and appellate attorneys in mid to large size firms, who do only litigation or appeals, work on more of a "bathtub" process. For each case they learn the substantive area of the law applicable to their case (typically working with colleagues in the firm who are experts in that substantive area of the law) thus filling up the "bathtub" of their minds while they apply their litigation expertise to present the case to a judge or jury in the most persuasive way possible. And at the end of that case, they "drain the bathtub" and move on to another case in another substantive area of the law.
Litigation is stressful and challenging. So, as a litigator, it can be hard to maintain a healthy work-life balance. Appellate practice is also stressful and challenging, though a little less so than a litigation practice. But for those who thrive on variety and challenge, litigation and appellate practice can be a way to keep the practice of law constantly fresh and interesting.
But beware, there are also some kinds of litigation for which there may be very little novelty or variety. For example personal injury litigators, insurance defense litigators, family law litigators, and criminal law litigators tend to litigate in just one area of the law. For many of them litigation can become a cookie-cutter, cut-and-paste legal practice.