Hair grows at about 6"/year... so... do what the rest of us do and... wait three years, preferably working with a stylist who knows what your goal is, getting maintenance cuts every couple of months to keep it healthy.
Other things you can do:
- Pre-natal vitamins actually grow hair like crazy in certain peeps.
- Wigs (no, seriously, *don't* do this, wigs = no)
- Condition daily, wash every 2-3 days (do not over wash your hair, srsly)
- Nothing
- No, really, nothing