I've been seeing 12:34 since I was a child in the early 70s, I received my first clock-radio for Christmas at age 7. The message to my sleepless self then, as it is now, was 'it's 12:34 am - it's sleep time'
Lots of different thoughts on what it could be, Doreen Virtue was one of the first I saw to talk about it, seeing repetitive numbers is considered in some circles a sign of an ascending consciousness. I liken it more to a greater awareness of our selves and our environment, and it's connection with the Divine. God is in everything, and messages and synchronicities through numbers, and other ways like Gematria, Bibliomancy, a song on the radio or a phrase heard from a passing conversation just at the right moment, all of it and more are ways that God/Source speaks to us
My personal take on it is that you may be seeing or will be experiencing, or something like that, a really good progression in things. Or a good step up. Probably related to what you've been focusing on recently