You can make WordPress widgets title clickable by adding custom links to them. Suppose if you are showing certain posts from a given category and you want category title get linked to the archive page of that particular category, or if you want to link recent posts widget title to your blog’s posts page showing all recent post, you can link title of any WordPress widget including the widgets you get from WordPress plugins, theme etc.
All you need is install and activate new WordPress plugin called Widget Title Links. After activation it automatically adds link option in all of your WordPress widgets, visit your widgets page in dashboard’s appearance section and add link to widget titles in whichever widgets you want.