I decided against replacing my theme with something entirely new. I have too many custom components baked in currently that I don’t have time to replicate afresh. Plus, all the feedback from folks helped me convince myself that what I have is good enough.
But, I have refreshed a few aspects in the existing theme. As advised by Khalid, I started with a typeface and replaced it with a serif one. It looks a lot bolder to me. A few clean-ups around accent colours. And a lot of moving stuff around.
What I have, thus, is something that looks different, yet is the same. The journey is incomplete yet, there are many ugly corners that need clean-up. But I will get to those as time permits.