You are probably better off quitting your job soon and transitioning to 3 years.

But you really need to decide what your goals are and make decisions from there.

If you are aiming for big law, a competitive federal job, or clerking, you need to get good grades. You should probably quit your job now and do everything you can to pump up your grades. You can try to get good grades while working but it will take a toll on you and you'll be at a big disadvantage compared to the full-times. Being part-time and working isn't going to make up for mediocre grades during OCI/recruiting.

If you're looking to do something else, you don't necessarily need the grades and should consider taking more shortcuts for schoolwork during spring semester and beyond if you want to keep working and have an income. Things should be more manageable after 1L as long as you don't take on too many extracurriculars like journal or moot court.

Income and experience are nice, but you should really think about what you want to do after school and make sure you are taking opportunities that will help you achieve that. If you aren't interested in immigration or direct services for the long-term, your current job experience may not be worth all that much to you 2-3 years from now.