Be professional and specific when applying for roles.
Do not apply for any roles that do not fit within your brand.
Customize your cover letters so they seem personal to each casting director. Instead of spending hours to personalize each letter, create a template with interchangeable words or phrases. This way you have the letter ready at all times and all you have to do it customize it.
Have a professional headshot that shows your brand. Casting directors do not have time to look at your headshot and figure out what you play.
They want their job to be as easy as possible, and you can help by customizing your headshot to your brand.
Be clear about what roles (supporting or lead) you've played. Many people still have character names on their resume. Casting directors do not have time to look up each character and figure out what your role meant to that production.
Vocalize who you are to make their jobs simpler.