Really Rimuru is not necessary now, since it has Rudra, Chloe, Guy and Milim (when recovering totally) to face Feldway and the rest of the enemies, although I do not think any of them has power to end Feldway for now Chloe can use reverse destination.
And that's why it would be good, if Rimuru stayed out of battle for a while, taking the whole issue of the protagonist to win the villains at that moment, leaving this task for those who have no great made, like Diablo, Ramiris, Zegion and especially Benimaru, who disappointed me a little at LN.
So despite being cliché, I would like Rimuru to return only to face the last villain of work, where Rimuru despite being op (because I'm almost sure he'll be there for a long time, gaining skills) I wish he would suffer to defeat the final enemy, this is quite predictable but if done the right way would be good, Even because I don't see any other end, if not for rimuru beating the last villain for whatever reason