If you foresee the advantage of changing template, then you can go for it. But make sure to back up your current template as a reference, in case if you wanna adopt changes in new template as you did on previous one by referencing to old template.
1. Go to Blogger Dashboard.
2. Click on your Blog Title.
3. Jump to Template tab.
* If you would like, now you can start customizing your blog template and personalize it as you need it to be. Start with fonts and colors. Read How to Customize Fonts and Colors in Your Blogger Template.