I had this same realisation about 6 weeks ago, I had fallen into a routine that was not bad but also never challenging or surprising. Since then I have been try

I had this same realisation about 6 weeks ago, I had fallen into a routine that was not bad but also never challenging or surprising. Since then I have been trying a bunch of new things to kick myself out of the rut. A simple idea is to take things you enjoy and do them with other people, for me this meant doing classes at the gym instead of working out at home, booking art classes rather than trying to learn from a book. In some cases this has been amazing (I found an olympic weightlifting class that is the most fun I've had in years), in some cases not so amazing but still glad I tried. Also I have started meditating (again within a teacher). For me the chief advantage of this is to start noticing your own patterns, and to be more deliberate in what you do. It has helped. ymmv