Is there a reason you aren't intending to push your maps through to ranked as per the standard osu! systems? If they are already well established beatmaps, it seems like you could quite quickly expand your maximum slots while also getting your beatmaps in a permanent state on osu!.
Really, really want to forgive me when I say this, but this statement holds quite a huge disconnection with... a lot of stuff. And I want to explain some of them here, both as a person involved in the Ranking process of these maps, as a player in the osu!mania community, as an avid VSRG fan and player, but most importantly as someone who wants to get the point across.
First and foremost, to any avid VSRG player/mapper, IcyWorld is quite a reputable name when it comes to the mapping scheme. He created maps that even today are still played and enjoyed by the community. It's undeniable that most people in the (osu!mania/VSRG) community know him for his content. However, most people should know by now as well that as Icy pointed out, most of these maps would be
COMPLETELY unfeasible to rank, and I'm talking from a BN standpoint as of now. Currently, most of his maps lack objective aspects that would deem the spread rankable with our current Ranking system, both Community wise and Mode wise.
Note that with this I'm
not requesting said criteria to change as to let all of this in. But realistically, were the case be that Icy wanted to rank his entire curriculum, it would still be unfeasible. And he's only ONE out of MANY mappers that would stumble upon the same problem. At the end of the day, BNs would be limited and that's yet another chokepoint to account for.
So, with that in mind, I just want to reiterate that despite the maps being overwhelming enjoyed, they're not suitable for the ranked section. What's the alternative then? The Loved section, and yet that still has its limits, such as monthly limitations, Icy obviously not being the only mapper to account for, ...
With all of this I just want to mention that getting some people's maps permanently engraved in osu!mania's legacy is not feasible by any means, and that's limiting the amount of players who can enjoy those maps.
With all that in mind, I at least want to point out that yes,
storage isn't infinite. We do understand that changes like this would affect all modes, and that only a quarter of said modes (Mania in this case) has such a big split between platforms. But I refuse to believe that absolutely nothing can't get done.
This is a fairly, fairly wild suggestion out of the blue. But creating a new category similar to Graveyard that wouldn't delete maps could be an option. And you could even add a way to encourage mappers to get their maps Ranked/Loved! The suggestion at hand would let mappers "store" maps based on the amount of maps they have contributed to the Ranking/Loved section. It doesn't have to be linear as going to mention, but if every time a mapper's map got Loved/Ranked if they could permanently gain a spot on this "Storage" category that would reassure them that it will not be deleted, could be quite a good middle point for everyone.
This system would encourage mappers to try bringing and officialize their stuff in the osu! community, while offering them the advantage of displaying more of their charts in return. This would only make more people get access to those charts, which means more chances of getting Loved or more reception by the BNs who'd be willing to rank those maps, making a vicious cycle.
I agree that such sudden suggestion would have to be better thought out, but making this kind of category has its advantages! Letting mappers have a way to reassure their maps not get deleted if they contribute to their community would let graveyarded maps to be purged more frequently, which basically would render storage problems basically... useless!
I also agree that the suggestion above might've stayed off-topic. But if the underlying problem to all of this is that there's no way to secure your maps' safety in the platform, that should also have to be discussed.
So to sum it up, with this I only want to give my insight of the issue that the current system has for mapper's to reliably leaderboard their maps and a suggestion that would both help mappers and the maintenance of the Graveyarded section.
Many thanks for whoever might've read this.