It depends on what timezone you are in, what kind of contents you are posting and what tags you are using.
for example, suppose you are a member of african steemit community. so their time of actvity on steemit should be times except there work schedules, other works and sleep time. if you post when they are active you would get responses from them. tags and contents elements will follow the same.. posting when your contents audience is most active will reach them the most.