Voyager 1 only gravity boosted at Jupiter and Saturn. That's not a particularly special alignment. Doing the same thing doesn't need a "grand tour" alignment, which happens every almost-two hundred years by the way.

Also it got most of its speed from Jupiter, and we can do a gravity assist with Jupiter any year.

And check out this plan for a double Jupiter gravity assist. https://www.hou.usra.edu/meetings/lpsc2020/eposter/1110.pdf