If you are a business there is one intimate relationship that you need to be having. That is the relationship with your analytics. You should have an ongoing relationship with your Google, website and all active social media platform analytics.
I know that you are out there reading articles about what is the ideal time to post to my account. While these posts aren't wrong in the posting times, they suggest just not work entirely toward when YOUR audience is active. The key to figuring out your ideal posting time is research, reading your analytic reports from Google and whichever other platforms you are focusing on. For example, you might be throwing all of your efforts into posting onto Instagram but you have 25% more traffic coming to your website from your Facebook page that you hardly ever update. This statistic should trigger in your brain to refocus your efforts and test for 5-7 days upping your Facebook posting habits to see if they remain the same, increase or decline.
Every single one of the accounts I manage is different, some have a crossover on the niche, but each of their ideal clients is different and unique to them as a business. Therefore making the "sweet spot" of posting times different for each of them. I know this because I am in an intimate relationship with their analytics. I'm checking daily the report of the previous day, how many profile visits, how many website clicks, what time of day was this all happening.
Social media isn't black and white it's a whole lot of gray. Things are continually changing, and you've got to regularly read your analytics and actively test to find what is working. If you're not you are wasting your time by putting in any effort at all. I encourage you to peek your social media analytics, Facebook and Instagram will display for you your top three posts of all time. Take a look at them and study what is the same or different about them. Study your location sources, I recently did an assessment for a client and the second and third most popular sources were coming from Canada which is a place we weren't even targeting, and the places we were targeting came in sixth and seventh. We had to refocus and study what we were throwing down and why we weren't getting the attention from the locations we were hoping too.
It's tricky I wish there was an easier way but this online relationship is the most dramatic, active and complicated one your business is going to have, so you need to take the reins and make your efforts work with you not against you. If not you're just wasting your precious time.