There are a few ways to get more game slots on your Nintendo Switch. The first way is to purchase a second Nintendo Switch system.
This will give you two game slots, which is ideal for when you have friends over and want to play multiple games at once. .
Another way to get more game slots is to purchase a Nintendo Switch Pro Controller. This will give you one extra game slot, giving you a total of three slots.
Finally, if you have a digital game code for a game that supports additional game slots, you can insert the code into the Nintendo Switch Online app and add an extra slot to your account.