Google Friend Connect.
On Blogger, most people follow your blog through GFC. So make sure you have a GFC widget on your blog and that it is easily accessible. Place it somewhere on your sidebar where it will be easy to spot so people don't have to scroll and search too much to find out how to follow your blog. I often don't follow blogs because I can't be bothered to look for the GFC widget. Sometimes, they don't have one in the first place, and I try not to follow through email because it can clutter my inbox. So having a GFC widget is a must.
Keep your blog open to public.
This way, more people will have access to it. It's very tedious when we have to sign in to our Google accounts just to view a blog. So if you don't have any particular reason to keep your blog private or only open to invited readers, just keep it public so you can gain more followers. People might even find your blog while browsing around the internet, and if it has what they're looking for, they might follow you.
I recently claimed my blog on Bloglovin'. It's a very useful site for bloggers and for people who like to read blogs. It's a great platform for exploring new blogs so who knows, someone might stumble upon yours and decide to follow it.
Social networking sites.
You can share your new posts on Facebook or Twitter etc., so your friends will know about your blog and if they're interested, they will follow you. You can even make a page on Facebook for your blog where you can share your posts so people will be up to date with your posts.
This is probably the most important tip. Visit other blogs, follow them if you like the content, comment on their posts and request for them to check out your blog.
Don't just go for the 'follow for follow' thing because there's no point in having a high number of followers if those people are not actually interested in reading your content or commenting on your posts.
Blog-walking is all about finding blogs that interest you and making connections with the bloggers.
Write good content so you can keep those followers.
More on this on my next blogger tips post!
I hope this helped :)
If you have any more tips on gaining followers, please share them in the comments!
Also, let me know if you want me to give blogger tips on anything.