The Flash Season 2: 11 Big Questions We're Asking After 'Trajectory'
3. How Will They Get Back To Earth-2?
The plan for Team Flash is still very much 'go back to Earth-2, stop Zoom.'
The first of the two problems with that comes in actually getting back to Earth-2. It's something they've spoken of doing, but so far haven't yet shown any sign of having a convincing plan to achieve it.
All of the breaches have been closed, and it doesn't appear as though there's any way to open them, so it's a question they're going to have to start answering soon. Indeed, if the Supergirl crossover does take place in the multiverse, then perhaps that could hold some clues.