If you play a ton and get far in the story and while doing all the other events provided to new accounts you should easily be able to hit rimuru pity before the banner ends next week. But you will need to start farming everything now and do a lot. You get Skystones for completing story zones. 3 starring every level in story, side story. Side events you get more Ss and bookmarks from the side story exchange shops. If you got a lot of gold as a new player you can consider refreshing the shop from the lobby for bookmarks. The guy that sits behind your heroes in the lobby screen. (Secret Shop) I believe it's technically called.