Well firstly it seems like you have a very 'varied' content types (in terms of genre), one person might follow for your travel posts and then not be interested in photography, nature, travel, youtube et al. Some people follow for followers (Which is a known problem), also your maths is a bit wrong, if you get 2-3 views with 100 followers you should only get 20-30 with 1000 (Ie a 2-3% Follow to View rate).

My biggest piece of advice: Make your content better, Honestly it is very lacking in the text department, Most of your posts are just a bunch of photos with no captions discussing them. People like to READ, and since this is mainly a blog/social site you really need to up your text game.

That's just my opinion anyway, hope this helped.