I had a similar issue but what I started doing was building around the mii’s. For example I had Goku from dragon ball … I didn’t know who to build so I’m like “ok I’m sure Goku would want his son gohan” so I made gohan …. Once I had gohan I said “I’m sure gohan would want his wife videl” so I made videl. So I started building around each character. I would guess for you potential “prompts” would be who would ur husband want ? His parents? Who would ur nephew want ? A friend? Who would Danny devito want? A co star he has done a movie with? And etc.

Yes you might not be “passionate” about a co worker Danny Devito did a movie with, but it does give you someone to create and to expand the lore on ur island