It sounds like there's actually at least one other direction you're able to go that you haven't gone yet.
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I'm not sure if this is the section you mean, but I've tried going in the section that's olive green in the map, but I don't have enough star power to get through the W shape and then climb up to get to the section to the left, and I also tried getting to it from below by star mode/platforms to get in from the blue/grey section, I can get just about there but as soon as I pass into the olive green section above (for a split second), I'm out of jumps and I fall back down... is there a different direction I'm not thinking of?
Also thank you so much for replying!!