Request for generation of writing prompts for journaling

Payload:
The previous 60 prompts have been provided as a JSON array for reference.

Guidelines:
Using the attached JSON of writing prompts, you should try to pick out four unique and intentionally vague single-word themes that apply to some portion of the list.
Then add two more single word themes that are fairly different from the other four for a total of six words.

Expected Output:
Output as a JSON list with just the six words, in lowercase.
Despite the provided history being a keyed list or dictionary, the expected return JSON will be a simple list with no keys.
Respond ONLY with valid JSON. No explanations, no markdown, no backticks.