Welcome to the community! Always nice to see people that start their privacy journey.
Maybe keeping those accounts is not a bad option. You should think about it and evaluate pros and cons. It is not necessary to nuke everything related to big tech.
For example, I would strongly suggest keeping your email accounts. I would clean them up, configure the settings to increase privacy as much as possible and let them sit there for a year or two before deciding to delete them (or deciding not to delete them). You never know what important service might be connected to that email unless you had a really good record of every account you have ever created there.
You could check out the comments I wrote about an example where I listed a couple of scenarios of using Facebook and different ways to minimise the tracking: