Hi Trinh. I'm in med, not law, so take what I say below with a grain of salt haha. Some of the downsides:
There's about 10,000 graduates per year so there's a lot of competition for a solicitor job. Not everyone wants to be a solicitor, but there's still a lot of people.
The work-life balance is very skewed towards 'work'. Naturally this depends on the office.
It's an intense degree and many unis grade it on a bell-curve so the marking can seem extra harsh.
It can still be a fantastic career. There's a wide range of areas you can work in -- obviously first you have a private and public divide, then each area of law inside of that, not to mention being a solicitor or barrister down the line. Even if you don't work as a lawyer directly your law degree can still be applicable to other jobs especially in the public service. Depending on the line of work you may be able to get some level of moral fulfilment from it. It can be intellectual stimulating (trust me, a boring job is hard).
Overall, I'm afraid I don't have much advice, other than it's not a money printer and you'll need to work hard to get a job in the field. However, even though it's competitive, those jobs still have to go to somebody after all, and there's no reason it can't be you. Best of luck with whatever you choose.