Steps to Reset Safari without reinstalling it :

• Select 'Preferences.' from the Safari menu. At the top of the new window that displays, select 'Privacy,' and then click the 'Manage Website Data' button. Click 'Remove All' in the following dialogue box. It will ask whether you are sure you want to delete all data recorded on your computer by websites.
• To erase data that could be used to track your browsing, select 'Remove Now.'
• The next step is to clear caches. To remove Safari caches, you'll need to enable 'Develop' mode:
• Select the Advanced tab from the Safari menu bar, then click Safari > Preferences.
• Select Develop > Empty Caches from the menu bar.
• Enable the 'Show Develop menu in menu bar' checkbox.