Move everything by a multiple of the grid. One or two measures or whatever. Then create a time selection that includes the brief silence at the front and choose time selection in the render window.
If you create a region around what you have now, you can just move the region over, and it will take everything with it. Then you could extend the region a little bit to the left and render the region rather than time selection.
I don't really understand why anybody would want to start a project right at 0. In future, give yourself some room by including a couple of blank measures to begin with.
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