First of all, make sure you’ve covered the basics.
Complete or update your bio, highlighting the personal or business traits you want to emphasize.
Add your personal or company website to your bio.
Consider updating your photo, especially if it’s outdated.
If you’ve updated logos or colors, you should also consider changing your header photo and/or your theme to reflect your fresh look.
Secondly, take a look at your posts, especially the recent ones.
Are there any that are inappropriate for your professional account?
If you publish something on the Internet, it lives forever, but you can delete anything you don’t want to draw attention to. Flippant comments or poorly executed jokes can have long-lasting consequences.
Finally, take a look at both the people you follow and your followers.
People you follow whom you may want to delete: Those who post about things that don’t interest you, those who never post, or those who live-tweet events or shows you aren’t interested in. You can consider muting them so their tweets don’t show up in your timeline, or you can stop following them.
For followers, are they real? Spammers can add fake accounts to your list of followers. Find out who’s fake, then delete or block those accounts.
Consider creating Twitter lists to organize friends or industry contacts.
You may also want to take a closer look at your app permissions. See which apps or sites you have given permission to access your profile and remove any that are no longer useful or relevant.