Which and version are you currently running?
The initial release of DOOM Eternal on Switch was a marvel, but subsequent updates drastically improved the experience. doom eternal switch nsp update dlc upd
When managing digital backups or installations, always install the Base Game NSP first, followed by the latest Update (UPD) NSP , and finally the DLC NSPs . Installing out of order can cause the game to crash or fail to recognize the expansions. Which and version are you currently running