Add the following if you want to make it.
-1000 pieces of armor/cosmetics but you get a single random one out of 500 after winning a multiplayer match. The other 500 are found on the open world single player explorable island you got or whatever. You need unlockable cosmetics for only winning a multiplayer match so the competitveness is there and drives people to keep playing/keep servers alive longer
-10 good maps for deathmatch
-10 good maps for your parkour thing
-10 good maps for your race idea thing
-a new mode with a one life rogue-like/risk of rain in first person mode. PVE and you get random drops for clearing a floor; each floor gets harder there is 100 floors and a final boss. With one life and 10 players or more its entertaining to watch the others still go on if you die. (perhaps revive each other using money but money, monsters and weapons, loot etc needs to be random etc)
-6 hour single player island thing you got going on. The island is segmented into 6 sections with each section taking an hour to complete. Each section has a theme; and each section has one boss maybe you are killing the 5 bosses to unlock the final section and fight a final boss idk. I'd suggest making this have multiplayer too and not just single player at least 2-4 player co-op but idk. Maybe aim for this adventure mode to be similar to a souls/from soft kinda design but a FPS
-improve graphics, models, textures further
-soulful music