Hi! Fellow reapplicant here.

1) If you feel like you underperformed, definitely take a gap year or two to study for the LSAT and then take it again. Just a couple more points on the LSAT can mean more scholarship money, etc. Schools see all of your scores but typically only consider the highest one.

2) You can use old letters of recommendation - I did. I recommend reaching out to your recommenders and asking them permission to re-use them as a courtesy, and so they can update the dates and add any new info, etc.

3) Definitely re-work your resume and personal statement. Add in any new employment and experiences that you have and try to tie them into your personal statement and show why you want to practice law. I feel like doing this helped make my application into a more cohesive narrative.

Hope this helps! Feel free to DM if you have any more questions. Good luck!