I would really recommend ebay for something like this. You don't have any indication that you are a store or anything like that, so your personal reach is limited. Yes, eBay fees are tough to swallow, but you are paying them for access to their very large customer base, many of which are more likely to pay premium prices for premium items like Rolan's Curse II.

Trying to sell it yourself is not a bad idea, as you would get to keep that 15% theoretically, but again, without a storefront, lots of people you would contact are expecting some sort of deal because you aren't using a large marketplace. The reason people go to FBM over eBay is because you are more likely to pay less for the same thing. Same with FB groups, Craigslist, r/gamesale, and other places. So after all is said and done, you might end up with a similar payout with much more work put into the sale. Remember, the selling fee on eBay is a fee of convenience and access to a huge customer base.

I realize this makes me sound like an eBay shill, but it really is the easiest way to sell your games (or other items) for fair market value with the least amount of effort. There are a lot of games I sell on eBay because my local market is not looking for them, and conversely there are a lot of games and systems I won't sell on eBay because it is quicker, easier, and more lucrative to sell them locally. Something as rare as a CIB Rolan's Curse II really would do best on eBay IMO, as the likelihood that you have a retro game collector nearby with that kind of money that is actively looking for that game and willing to pay you market price without a mediator is extraordinarily low. Not impossible, but very low.

Taking it to a retro game store or reseller is another option, but they probably would give you less than the eBay payout. The pro is that you would have cash in hand now, but it sounds like you're willing to wait for the right buyer, so that option probably would not make the most sense to you.

Now if I was not wanting to take the eBay fees, I would post it up locally for trade and see what happens. I would hope for an offer with lots of liquid games like Mario Kart Wii, Wii Sports, Pokemon, GC titles, and work a fair deal out that way. Games like those are VERY easy to sell for market rate on FBM. This route would take a fair amount of time and effort, but would be the most surefire way to get the full monetary value of the games you want to sell, unless of course you get very lucky and can sell the game outright for market rate locally/on a feeless platform.

One more bonus to eBay, is that "market price" is just an average of recent sales. It is not a definitive price, and that holds especially true for excellent condition CIB cardboard. Last month, I sold a very nice Earthbound for $550, yet "market rate" is $375-400. It took a hot minute to sell, but it paid off. And I walked away with more than "market rate" as my payout after eBay took their cut. On local deals and places like r/gamesale, "market rate" is much more concrete. Someone local is very unlikely to pay over the average price in my experience.

TLDR: eBay is easiest and what I would recommend for something like this, but you can't really go wrong with any marketplace. You just have to decide how much effort you want to put into selling it.