For new keyword research, use the Keyword Planner. After searching for new ideas, you can click "Download Keyword Ideas" to save the entire list to your computer. 3. Downloading Live Search Results (SERP Scraping)
If you want a list of everything you have ever searched for while logged in, Google provides a dedicated tool for this. google search list download
This is the official way to export your account data. Visit Google Takeout, deselect everything except "My Activity," and specifically select "Search" to generate a downloadable archive in JSON or HTML format. For new keyword research, use the Keyword Planner