Hi.
First, you should try to acknowledge that it won't be possible to analyze where you left traces behind and match them to you.
This is partly a good thing - the data is there, but probably no one can tell that it was your data.
On the other hand, you have no chance to delete it.
Then try to get the big data harvesters to delete your data. Here is an example for google:
https://www.cnet.com/news/privacy/theres-a-way-to-delete-the-frightening-amount-of-data-google-has-on-you/you should vaguely know which big systems you used over your 10 years. Try to contact them. If you are a EU citizen, you can use the GDPR to do so, this makes things a bit easier. In your country similar laws might or might not exist. If you are a EU citizen, feel free to say so and I can help you formulating a default letter you can use.
Prevent further data to be mined. Say goodbye to the big networks, such as Facebook, X, Instagram, Google, etc. I see you use GMail? Change it. Check Prism
https://prism-break.org and consider exchanging some of the software you use with the alternatives they recommend - OpenSource isn't a panacea, but it helps, and using Linux is a good idea if your game is digital self determination.
Your Browser takes a central role. Use Firefox. Deactivate the submission of data, and install the plugins uBLock Origin, NoScript, HTTPS everywhere and Privacy Badger. Set Startpage instead of google as your default search engine.
This won't totally prevent you from getting data mined, but it will reduce the amount drastically drastically.
Hope this helps.