It almost impossible to that all the data collected from you (by all the apps you used, no only by Google) will be deleted, mainly because it's already out there being traded by data brokers. That's why I think that deleting your accounts is not the best approach for privacy. I think it's best to keep an old phone with all your accounts and every now and then watch a random video, make a random search, follow a random profile, and so on with all your accounts. Over time your true profile will become obsolete and buried under fake data.