It could be something to do with the new algorithm which means that you need to connect more with the Instagram community. In terms of taking a lot more time to follow/like other users with similar content/interests and engage with content e.g more commenting. If you havent changed anything else, Id say it could be the 2018 algorithm changes.
Post the best pictures from your gallery. You know what the pictures which you don't like also will be heavily liked by the people who see it because every person's like is not the same. Put the best get more likes to your upload. Can check my Instagram pictures @iamdeepakdeepu
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