Pretty simple, you have to softlock yourself as fast as possible, as in the only way to free yourself from that softlock is to delete your safe file.

Softlocks that are fixed when reloading the game do not count.

I’ve found various ways to softlock the game, all of them can be fixed by reloading though.

could you show us a softlock? because we currently haven't found any ourselves (sorry if you were expecting us to have one already! also this would most likely be in the category extensions, but we don't have many ideas for it yet so yeah)