Well a tuition waiver is a big help! But it's still a huge investment of time, so it warrants serious consideration of why you want to be a lawyer and what you would do as a lawyer...and especially if your conception of those two things is realistic.
I'm not gonna assume you think being a lawyer is like what you see on Law & Order or The Good Wife or whatever. Actually, it's not totally unrepresentative if you are a DA or PD (public defender) or something. But as with all things, it's never as sexy as on TV. But there are so many types of law. Is there a certain type you are dying to practice because you are passionate about that subject area? Is there a certain skill you associate with being a lawyer that you think you have in abundance and/or could cultivate and enjoy using a lot?
I worked for about a decade in one career, then got a JD and practiced as a lawyer before retiring early in 2018, so feel free to ask me more specifics. I didn't love being a lawyer anymore than my previous career, but there were things I disliked about it more than my previous career, which were mostly really random things that might be really personal to me (here's an example - I worked at a big law firm as a lawyer and had worked in the public sector [and in non-profits] before. I really missed the sense of us all being on one team working for the greater good...in a law firm you are just a random collection of people developing your own practice and business and leveraging some economies of scale by doing it together. There's no sense, in my experience, of all having a collective purpose that you are trying to achieve, and that's just something random I personally missed as compared to other jobs).
I also became pretty disillusioned with the justice system as a whole. In law school, you will learn that our adversarial system is a really awesome way of getting to "the truth" or a fair outcome. That putting forth the best arguments on both sides makes the "right one" rise to the top and you can be really confident it has risen to the top for the right reasons. But what I've actually seen is that smart lawyers can make a super good case, based on law, precedent and much else, for anything. Like literally anything. Like, you could give a good lawyer an assignment to find out why we all have an obligation to be cannibals. I mean, seriously. In the end, I'm finding it more morally bankrupt to take a position and find the best arguments for it than to cultivate evidence and see what position it leads to. I mean, apart from the actual injustice in our justice system (like more money = more justice), which trained lawyers can actually work together to change...it's a bigger problem that I ended up just not being totally onboard with the basic construction of our adversarial system altogether, which no one's gonna change.
But you know, that's very big picture. I was perfectly happy practicing as a transactional lawyer, helping my clients create and execute good deals that would hopefully help them avoid needing a litigator in the future, without daily meditations on the intellectual bankruptcy of our adversarial system. There are in fact so many types and ways of being a lawyer, that one of my 1L lecturers told us that if we were unhappy when we were practicing, we should do something different, because there are so many options, anyone should be able to find their calling within the field, once you've gone to the trouble of getting a JD and becoming the member of a Bar. And if that's true, then maybe it's worth your investment of 3 years of time and lost income. But, I do think it bears more careful thought, so feel free to post here more about why this has specifically been a goal of yours all your life and I'm sure the lawyers and former lawyers here can tell you how actually going to law school may or may not help you realize your goals.
One more thought to add - it pays to go to a well-regarded school. I mean, literally pays money if that's where even a part of your interest lies. Where I went, we all had a chance at interviewing with top firms because of our school's reputation. At other schools, only the top 10% of a class even had a chance at interviewing with top firms. And same goes for opportunities that don't pay well, but could lead to prestigious positions or opportunities to really change the world (if that's more your speed). Having a top law school on your resume gets you there, at least faster. So yes, retake the LSAT if you decide to go and if you possibly can. I hate to be elitist, but if you just get another job making 75k (which is definitely the starting salary in some markets at a mid or lower tier firm), are you going to be happier than you are now? Same comparison if you have big dreams of working for the Justice Department or the ICR or the Innocence Project. Elite law schools help you get the experience and connections that make those things more possible, faster.
So, sorry that all was so long. I hope some of it is helpful!