Graphic designer needed to supplement agency work

I am looking for a graphic designer I can send multiple jobs to that will help me catch up on my agency work. We've grown to the point where I need some help, but am not ready to hire full time just yet. Looking for someone I can have a longstanding relationship with. The types of projects we do include:
logo design
branding identities
business cards
brochures and layout
flyers
signs
car wraps and vehicle wrap designs
window wraps (specifically large sets of windows)

I am attaching some examples of some of these projects for various clients here.

I will need someone to quote me per project so that I can accurately price my clients on the front end.

We work out of dropbox and monday.com for all our jobs.