What are your resolutions? What are you changing? In particular, what efforts are you going to make to ready for your viva?
Change can be good, but it’s worth asking whether or not you need to change in the first place. Do you really need to make big changes to get ready for your viva? Do you need to give everything 110%?
Maybe you don’t need a New You.
You’ve not got this far by accident. Old You is up to the task.