I've been in your shoes before, trying to figure out the best time to post on Instagram for better engagement. From what I've found, it really does depend on your audience, but there are some general time slots that seem to work well for most accounts. I've had good luck posting during lunch breaks, around 12-2 pm, and also in the evening, around 5-7 pm, when people are unwinding after work. However, if your audience is based in a different time zone or has different habits, you'll need to experiment to find what works best for you, so it's worth tracking your analytics to see when your followers are most active.