I think about that a lot. Just haven't got the nerve, at this age, to take that "leap of faith" and hope I land on both feet.
There is no better time than now, as the days aren't getting any longer, and you already have plenty of live experience to give some/ anything a go.

Not only close it but seal it up with cement and....don't look back!

That is a good way of looking at it, and it tells me you are your own master in reality; plus deep down you are strong than you are able to admit).

...and it doesn't necessarily have to be outside of music.
So what is wrong with taking up the Didgeridoo? ( Ok I am from OZ) Lol. If it stirs your soul and gives you peace, do it!