the main feature of this map is the fact that there are portals that lead to an identical underworld version of the map. however i feel like it isn't incentivised enough for players to go into there as most of the exit locations back to the real world generally don't put you anywhere meaningful.
maybe the exit locations could be put into more flanky locations and/or give the player move bonuses than just a small amount of health upon going through a portal. like maybe also a slight speed boost for a couple of seconds.

as for the other gimmick of this map being the skeleton coffins, i don't think i've ever even seen or fought a skeleton on this map due to nobody choosing to willingly go into coffins. because why would they? a thought of mine could be to revamp them with the new feature added this summer with a map being now able to spawn in team colored skeletons, it would at least now somewhat be incentivised now to go into coffins i guess, other than that i don't really know how you could even do anything else with it