As a glance at my profile will show, I am fond of Tolkien's work, and one of his poems seems apt here, as you close one door and open another:

The Road goes ever on and on
Down from the door where it began.
Now far ahead the Road has gone,
And I must follow, if I can,
Pursuing it with eager feet,
Until it joins some larger way
Where many paths and errands meet.
And whither then? I cannot say.

So while none, save perhaps Janus, can say where the door you are about open will take you, I am sure that the journey will prove to be its own reward. Congratulations, Jazzoctopus, and all the very best.