Assuming you need to keep your account for work, here are the direct links:

1. Go to this page and turn it off: https://www.linkedin.com/mypreferences/d/settings/data-for-ai-improvement
2. Submit this form: https://www.linkedin.com/help/linkedin/ask/TS-DPRO

In addition:

• check this page for other privacy settings: https://www.linkedin.com/mypreferences/d/categories/privacy
• Delete unnecessary personal information:
  • Profile image > Manage > Posts and Activity
  • Profile image > View Profile > remove anything you don't need to include
  • Go to this page and delete old resumes: https://www.linkedin.com/jobs/application-settings/