People often post their older blog things here. Just link to the original source and confirm that you are the author of the original piece. If your original was good as is, that is fine. If you can touch it up with formatting, and or images to support it that is worth considering too.

Sometimes stuff from older blogs does well. People will be fine with you sharing your own work.

You can also use images and videos that are not yours just make sure you properly credit the source.