How can I increase my Google+ page followers?

1.
To Increase your Google + followers you need to post regularly on your page.
2.
Follow related industry people and add in your Circle 3.
Share your profile on your Facebook, Twitter , LinkedIn and other Social Media Websites.
4.
Integrate your Google+ icon with other social media on your website, so people know that you also have Google+ Page 5.
Use Google+ icon with a link to your Google+ page in your Email Signature.

Having done this for various pages for brands in multiple categories, these are my TOP 5 learnings: 1.
Profile : its important to have a complete and well crafted profile.
Like a person, the + profile should Describe as well as Differentiate, it also works best if you can inform potentials/ visitors what it is that you're likely to provide consistently...
your Focus / Subject area...
'why should they add you to their circle' 2.
Broadcast: If you're serious (if you're not, why waste your time!)...
- Promote the G+ profile across all your Digital assets - Web (Site, Blogs, Social) & Mobile ..
aggressively.
Post snippets to your established assets to make people visit back.
The good thing is that most people have a Gmail account, so adding you (if you're relevant & interesting) is really simple.
- Interact with ALL that you can actively dig up, who are aligned to your Focus/ Subject area, and my interact it means NOT JUST on G+ but also other social platforms using your G+ credentials...this cross-fertilization has bought me the most results always - Engage with everyone who takes out the time and makes the effort to add you/ comment/ contribute anything & Also request fellow like-minded to guest post to your Circle 3.
Content / Context: all of us like new news and deep / opinions on subjects that interest us, make your content not just focus and interesting but also topical, humorous, rationally opinionated...
human qualities we all admire and are attracted to, stand for a tone and a voice that resonates with your brand/ purpose...
and be consistent both in presence and visibility 4.
Evangelize internally: you obviously work somewhere, get people at your workplace aware of what the G+ profile does, get them to visit, get them to add and also get them to contribute meaningfully...they can (and will) become your strongest ambassadors if they see value (which is why you're doing this right? :D) 5.
Be Personal: (this is, in my opinion, the most important, after having a good profile) - with people in your circles share a personal point or two, connect on worries, ask for advise, admit being stumped or not knowing answers, vibe about other interests...
lets not forget, this is Social Media, being successful socially means really having the rapport to be 'allowed' to be personal, its hard earned, but the benefits are also huge

Google+ is just like any other social network.
In order to be social, you need to have friends.
You need other people on that social network to interact with, people who are active members of that social network.
If they don’t log in on a regular basis and keep their profile active, they can’t interact with you.
In order to build up your social media presence, you need to be active, as well.
Build your profile as well as you can (just as the other replies have mentioned) and then find as many people that are relevant to you and follow them - do this as many times as you can and wait for them to follow you back.
Note: is they aren't active then they won't follow you.
Once you have your desired quota of followers, you can then start looking at Circles and adding/removing followers until you reach your desired goal.

- Complete profile (This is very essential) - Good Circle Creation - Good Content Curation to send to the right Circle - Share link of Google+ on other Social Networks - Do comment and engage other peers at their profile - Who are we kidding Google+ is for hardcore Geeks.
So, do engage Geeks at twitter Chat Hope this helps :-)

Well, first of all I would like to thank Reem Boudraa for giving me an honor and opportunity to respond to this question.
The points include: a)Promote Your Presence in Other Social Networks.
b)Your sharing content should be more then awesome.
c)Encourage your current followers to Share Your G+ Posts.
d)Be Visual e)Utilization of Hangouts Feature.
f)Profile Completion and your social media integration on other social media platforms.
g)Invite & Follow People.
h)Fill Out Your Google+ Profile to each phase.
i)Make Your Posts Public.
j)Regularly & Frequently base group & page participation and social engagement is also one of the most essential factor in order to increase your followers count.
But the most important thing among all is that your followers circle should be specific related to your interest, your hobbies, or your professional expertise, skills set so the more relevant followers, leads to most participation and social engagement of your followers on your G+ profile.
Have a great day to all.
Syed Waqas Saghir Internet Marketing Expert, SEO Consultant, Social Media Evangelist.