Youtube Expert for a small project

I have an old youtube with a numeric url that needs to be updated and made to work with all my social media accounts. I am assuming this requires a bit of under the hood work, and organization such as changing the old core email to a new email, updating the youtube url so it is my musician name, etc. Maybe even moving the channel to a brand account? I'm not well versed in youtube's more advanced functions and the proper way to organize it. I'd like to try to keep the old youtube account and just tweak it to have a proper url and maybe delete any old redundant accounts. I could also use some coaching on how best to set up video channels for use with my website and social media, thus, a phone consult might be required. Here is my youtube channel for starters- https://www.youtube.com/channel/UCYx6zr9dcQOwj5VBlkpBRzg