[2022] Is there a way I can start a new crisis after the last one was a bust?

Create a backup save before doing any of this stuff!

crisis.1000 - Unbidden
crisis.2005 - Contingency
crisis.10 - Prethoryn

bring down the console with the ~ key, and then type: event crisis.10 in the console. This will spawn the Prethoryn, or you can substitute any of the above for crisis.10.

There may be other issues force-spawning a crisis as a warning.

Enjoy!