5. BEST TIME TO POST
This is tricky, because Instagram has changed the algorithm on how it shows posts. However, most would agree this still matters a bit. You want to be posting when your target audience/followers are most active. This is usually early mornings/late at night depending on where you are in the world. There are many apps available that will tell you the best time, but their reliability or accuracy is not confirmed.
6. POST FREQUENCY
This point is more relevant to getting followers quickly. The more posts you make, the more often your content is going to appear, but do not feel like you need to post every day if you do not have the content to share. Quality over quantity.
In saying that, if you want to go this route and you have ample content to share, try to post once a day to help keep yourself visible. If someone has liked your content, you are more likely (basically guaranteed) to show up again in their explore feed at some time. If your content keeps showing up they may follow you. If they are consistently liking your images, regardless of following you, then you should also be appearing in their followers explore feed.
Pictures that a longer vertically than horizontally utilize more screen real estate, and therefore spend longer on the screen when scrolling through a feed. Users have suggested in the past that they notice more likes on pictures that are orientated this way.
A comment pod is made up of about 10-15 people. This group always likes and comments on each others pictures. This becomes most beneficial if it is done as soon as a picture is posted as it helps boost the instant visibility of the post. The more followers each member has, the more benefit it is to the person who posted the picture.
Usually these pods exist via the DM feature on Instagram. When someone posts a new picture, they also share it to this group so that the group is notified and can instantly go and like the image.
These pods work best when everyone in the group has the same niche, as it means everyone's followers are more likely to also like the content.
A much hated tactic by many, but without a doubt one that works. I discourage the use of this, but it is such a popular technique it needs to be stated - at the very least, so you can understand when it happens to you.
The idea behind this is that you will follow a user and they may follow you back. After 2-4 days you unfollow them and hope they don't notice, leaving them following you.
In reality, why bother unfollowing them? Just follow them and like their images whenever you can. You'll come across much more genuine and you'll also avoid the risk of losing them as a follower.
This is considered a scummy technique to use by many, and with the amount of people that use apps to keep track of followers, it is less likely to work.