I was always taught from the beginning that your blog is your realestate. That is where you can put the information about yourself to build authority and build followers. As your blog is your real Estate as others have said you can do what ever you want on your blog and it should be there for perpetuity if that is what you want. Your blog can be used as a marketing tool, provide value and get regular readers, or solely as a list builder. You can use it for reviewing products, or reminding customers of upcoming sales if you are a retail business of some sort. I saw earlier someone in the meat industry. You can use a blog as a place to tell people about cuts of meat, the best ways to use them, provide recipes, all sorts of things. Keep a regular review on some of your older posts to make sure that the information is still useful. You may need to review some to make sure that videos are working properly or anything else you have set up on the posts are directing to places they should. Have a great day