If you haven’t seen Pixar’s The Incredibles, it’s definitely worth watching. Below is from a scene where the super suit designer is revisiting her past work with a client.
Bob: Wait, what do you mean? You designed it.
Edna: I never look back, darling! It distracts from the now.
Your logo, colors, images, everything, is meant to be improved. Always. While we obviously don’t recommend you reinvent the wheel every quarter, we also would like to remind you that marketing (and by extension, design) is a shifting target and a fickle, easy-to-bore audience. Have fun with it, think outside the box, take more chances.