Ask the companies that buy and sell people's details to erase yours. You send every request from your own email, so replies come straight back to you.
Only what the companies need to find your records. Put each item on its own line.
The same letter goes to every company. Your details are blacked out here until you choose to see them.
Each button opens a new email with the letter already written. Check it, press send, then tick it off here.
These stop a lot of the data at its source.