I am looking for a virtual assistant

I'm a bestselling author, looking for a virtual assistant to carry out the following tasks for me:

Book promotion - book me in for interviews in magazines, on the radio and on TV
Find networking events - book conventions, book fairs and other events
Research on various topics for my youtube videos and my blog articles - on self-love, healing, relationships, dating, mental health and more
Write scripts for my youtube videos
Respond to my emails and file accordingly, flagging up important stuff for me
Keep a note of my calendar and any upcoming events I have
Oversee my social media accounts, respond to DMs, reply to comments

I'm looking to work with someone over a long period of time so please provide me with your price for a monthly basis, thank you.