There are a few ways to fix Joy-Con drift on your Nintendo Switch, including updating your controllers and calibrating the sticks.
Nintendo Switch: 5 ways to fix Joy-Con drift -- with or without tools - CNET
How to Fix Joy-Con Drift with No Tools - TeeChu
Nintendo will now repair Joy-Cons for free – even if your warranty has expired - Mirror Online
How to Fix Joy-Con Drift Without Disassembly - iFixit Repair Guide
How To Fix Nintendo Switch Joy-Con Drift
How To Repair Nintendo Switch Joy-Con Drift
How to fix joystick drifting on a Nintendo Switch
How to Fix Joy-Con Drift Without Disassembly - iFixit Repair Guide
How To Connect (And Disconnect) Wireless Nintendo Switch Controllers
Joy-Con - Wikipedia