Whilst you want to be consistent in the frequency of your posting, make sure you mix up the rest of the details!
Rather than always post at the same time, why not experiment with being active on your social media channels at various times and days e.g. outside normal business hours or on weekends. By changing when you post, you have the opportunity to engage with a whole different audience.
You can use the analytical tools available on any social media channel to find out when you’re most successful posting time is and reformulate your social media plan to encompass those popular times!