Open the Google app on your phone
Tap your profile picture in the top right
Tap Search history
Tap Delete
Choose Delete today, Delete custom range, or Delete all time
Confirm the deletion
Open Chrome on your phone
Tap the three dots menu
Tap History
Tap Clear browsing data
Select Browsing history
Choose the time range
Tap Clear data
Open myactivity.google.com in your browser
Sign in to your Google account
Tap Delete
Choose the time range
Confirm the deletion
Turn on Auto-delete in Google Account settings
Choose an auto-delete time period
Save the setting