I was thinking about this before going to bed
Well, I saw Billie's interview with James Cameron, and the interviewer asked two of them what's their fav Billie song. Billie said "Chihiro," but James said "her next song", and I've seen people saying he's hinting that Billie is going to release a new single, and I was thinking, maybe the hints (purple and green rings, etc.) were hints for a new single and not an album, because also, Billie said she still doesn't even know what the album's vibe will be, so It's clearly that she has no idea about what the next album is gonna be.