Interactions with other accounts and the time of day to post as well as hashtags all work but an attractive post may work best when it reaches its audience.
The “cooler blues and greens were correlated with more likes than warmer reds, yellows, oranges and pinks” (Eggert, 2016) – I always thought warmer tones were more attractive but “People tend to associate blue with openness, so they’re more likely to want to stay in contact with that color” (Laliberte, 2017).
Regarding my practice on Instagram using pinks/oranges I have always received good interaction/attention still.