How can I market an iOS app?

Hi, I am new to forums & I'm hoping I can get information on how to market an iOS app in an affordable/free way. Any information would be much appreciated.

I have read about creating a blog, which I have done.
Also about app competitions, but I have not found any I am able to join.
I have also looked into free app promoting company tappx which has been very useful.
I have also used all my social media outlets; facebook, twitter, instagram, etc.

I am looking for more and other ways to promote, thanks.

$$...buy advertising...

It is complicated, especially for indie developers. You should try to get reviews about your application on popular websites, especially on YouTube from well known app reviewer.

You could post it on an appropriate subreddit.

Besides creating blog, you can try to find bloggers that will be interested to cover your app. It is affordable for sure but it will take time because I contact the bloggers one by one.

I develop Catholic apps, so I can only reach Catholic bloggers. Many of them are interested to give the apps I develop a try and review them.

First, I would like to tell you how impressive it was for me that you were able to create an ios app! Marketing it is another tough venture that I believe you could do. Try using social media platforms because they are truly effective. It's hard to market in free strategy, you should at least spend some bucks in order to gain more possible buyers. Sometimes risks are returned greatly.

Think about where your target audience hangs out.
Are they all on instagram? Maybe on twitter?
Is there a special interest forum that your audience uses?
Social media is vast
Focus your efforts on the sub-section where your audience can frequently be found.

Which articles and publications would your audience have read?
Reach out to those authors and pitch them your app

Hope this helps

Post in forums and offer beta testing through Apple's Test Flight program.

All you really need is to catch the attention of someone at a news site to get you started. Improve from there.

Apple's TestFlight winning over devs and testers | iMore
TestFlight in iOS 8: Explained | iMore