I’m going by the MC throughline video on Subtext-- the final Signpost was the thing that would lead the MC to the Solution.
Edit: This is the best I can do right now for this:
S1: Wanting to be useful and belong, MC is so preoccupied with thinking of potential mistakes he might make whenever someone needs help that he doesn’t get things done and lets people down.
S2: When MC’s only friend persuades him to join his musical act, MC’s performance anxiety causes his mind to race with contingency plans that he forgets the song’s words and freezes.
S3: To avoid potentially ruining anything else, he becomes a worse person by refusing to help anyone (maybe that’s not Becoming enough since I can’t see him permanently ridding himself of a helpful nature. Maybe Becoming can be that he lets a bug die rather than interfere and help it), which exacerbates feelings of uselessness.
S4: He has an idea that can only be done spontaneously. When nothing goes wrong despite lack of planning, he changes from Determining that failure is the result of his failing to plan enough to forming more realistic Expectations (planning and success aren’t necessarily linked). Being no longer afraid to help makes him feel more useful.
I might have Determination and Expectation reversed and should have the Problem being Expecting things to go wrong all the time causing him to over-plan and solving it with Determining other factors that might’ve caused failures, or better yet, even Determining ways that failures might lead to improvement.