How does this work?

My competitors have 10-20k backlinks and 30+ DA score

1) Will I need a similar amount of backlinks to compete?

2) Can I reach a similar DA score while building 5-15 backlinks a month?

3) Does the amount of backlinks matter?

4) How can I know if my competitors backlinks are good quality and relevant to them?

Thank you for your time and I appriecte all the help!