After you get 100 followers, look at your free TikTok pro account to see when users that like your videos are usually online. Try to publish a video when people are most active.  According to research from Later, Monday to Friday at 1 PM is the optimal time for posting. However, there are plenty of variables, such as time zones and niches, so that’s not guaranteed.  If it’s engagement you’re after, Later’s research also found that Thursdays and Fridays get the most attention.