Use verification tools to ensure your NSP and DLC files aren't corrupted, which protects your console's NAND. If you need help with this, tell me: Are you having trouble with installation errors ?
For the optimal experience, a user typically seeks what is colloquially known as a "Complete" or "Super" NSP. This is a pre-compiled file that merges: Fire Emblem Warriors Switch ROM NSP UPDATE DLC
Fire Emblem Warriors for the Nintendo Switch is widely considered one of the most polished entries in the Warriors (Musou) sub-genre, particularly for its successful integration of strategic RPG elements into fast-paced hack-and-slash gameplay. Fire Emblem Warriors (Switch) — A Fan's Deep-Dive