Grow your Blog Organically. Don't force/ask anyone to share, follow or comment on blog. Just focus on promotion.
Don't just type, talk to your audience. Blogging is way big a market on internet and people will like you if you do more than just providing information. Suggest, express, appreciate, criticize and have an opinion to build a relativity to a like minded audience. Make them feel that their visit to your blog matters to you.
Forums are good way to drive traffic if you are regularly posting something.