Be active in the community, people will notice and if they like your answers they follow. You can also comment, ask questions too! It takes time to build up a following, it's not like Facebook. Green thumbs and followers are great but remember it's not about the numbers,not popularity, it's about helping. ( ok numbers are great, : ) but the best is knowing you helped.)
you will have to prove that you are a smart, cultured, well learned, honest, genius, opportunist, full of knowledge, a knowledge bank, bold, and logical while you answer the questions which people ask. Yes you follow others and others will follow you.