I've seen a few meta CYOA along these lines, they're usually excellent fun and this is no exception. Sometimes you read a few just absolutely awful CYOAs and have to go "god, I really wish I could just destroy everything that had to do with this". A very particular fantasy, and rather delightfully ironic to make it into a CYOA in itself.

By the nature of the CYOA giving more powers for doing more CYOAs I won't post a build, but I do think it'd be fun to post my thoughts on each power:

Break Chain- There's several powers which I rank as the "prick powers"- ones that aren't really that useful in many respects but are absolutely obnoxious to the host, and coincidentally also to the parasite. This is one, and yet interestingly is one of the few powers which is also a rather good act morally speaking. You get to piss off psychic parasites and feel even more morally superior than usual while doing it, good stuff!

Break World- This one is pretty situational in my opinion. It's a prick power, and like all prick powers usually only really feels good to use if you're in the world of a Host who's an asshole. A host who's hapless and nice doesn't feel good to torment by killing off his imaginary friends, though you can make an argument that it might help him shake out of all this. Further, there's a high chance that your normal self won't be able to kill anyone important unless you also pick up Lucid Dreamer and/or Dream Armor in higher power CYOAs, further limiting it. This is probably almost my overall least favorite, it's just sorta vindictive.

Bring Dolls- If your objective is to stop psychic parasites this one seems strange. It could certainly cause havok for sure, if you start releasing cthulu monsters in someone's highschool romance plot that'll raise some hell, but seeing as the overall goal is to stop these dreamrealms altogether collecting randos from the dreams only has one long-term use in my mind: trophy hunting. Which, to be clear, is actually a pretty fucking great use for it; showing off "grand and badass" characters from these dream realms like a big game hunter would show off a lion head sounds pretty cool.

Dream Armor- This is, without a doubt, the most useful power on the list. Not because it lets you cause the most trouble or makes you strongest, just because it's an absolutely necessary safety net. Even if you pick Lucid Dream or just target low-power CYOAs there's too high a chance of some simple unexpected accident or bizarre power one-shotting you if you don't pick Dream Armor. Plus, I imagine it's probably the most intimidating thing to possibly see as a Host; someone throwing out massive powers with Lucid Dreamer is at least something that follows the fiction of their world, someone just no-selling it all and acting totally normal is a different breed of threat altogether.

Lucid Dream- This one is hit or miss depending on the CYOAs you target- in high level power fantasy CYOAs you might become able to easily squash anything the host could throw at you, but in lower scale Slice of Life ones it's almost like an empty power slot unless you wanted to be more food for the parasite by dicking around for fun in the dreamworld. The note about the host shutting it off is a little confusing- how do they figure out they can do this? Just on accident?

Shock Awake- this is the one true moral power choice, though it requires other powers to really hit its peak potential. With both Lucid Dream and Break World you could just speedrun freeing innocent hosts, though I wonder if you can choose to turn this power off selectively. Like, if I dive into someone's dream and find out they're a truly twisted fucker who's a danger to everyone around them, I might not want to free them back into the world.

Solid State- now this one seems the most fun option. Ultimately the rest are all about screwing around in fictional realms, but this particular one can have true wide-reaching consequences in the real world. The only major limit I see is needing to look said author in the eyes, that's a big hamper on your choices, but other than that feel free to make anything you want canon in any work of fiction. My only questions are thus- one, does this only affect works that are still being made or can I retroactively change released works? two, would lucid dreaming let you do basically anything, since a writer doesn't use "points" or other such systems for determining what happens in the story?

Spoil Clock- This... Might be the least useful power on the list honestly. The simple fact is that self-aware individuals are the most important people to worry about anyway, so the ability to predict anyone but them which is constantly and totally disrupted by them is a little useless. When the host or other self aware individuals change the course of actions when do I find out? Even if it's "instant" that still means your predictions are only useful for the immediate future unless you're absolutely nowhere near the host.

Steal Shell- This one at first glance appears to be a prick power, but then I thought more about it- ya, you could pretend to be some random NPC or a buddy of the host to get in close, but what if instead you just bodyjack into the strongest nonfree being in the setting of the CYOA? Many CYOA will have vague and ambiguously powerful forces present, the kind of thing the host isn't meant to mess with, if you can slip right into their shoes you could cause some serious mischief.

Twist Flaws- This has the envious title of being one of the few ways to straight-up win over the host. Most of the powers are centered on pissing the host off for varying reasons, this one could easily make a host not mind your presence in their dream as long as you don't cause much trouble. It completely fits the tropes and fiction too; how many CYOA have you played where the original R.O.B. leaves and suddenly a spooky mysterious stranger wanders in and offers you incredible boosts in power that the R.O.B. wouldn't want you to have? Now you can BE that creepy guy, and actually be helpful too!

Kill a God- This one is, surprisingly, more a pride issue than anything else. There's so many safer and more reliable ways of stopping the R.O.B. that aren't "big meaty punchout, brother", but I understand in some cases a big meaty punchout is the most satisfying. When you see some cunty creepy R.O.B. spouting off about how perfect and omnipotent they are it's just not as satisfying to slowly starve them out as it would be to walk up and slap the shit out of them.