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
Switch players have found a way to fix Joy-Con drift - using cardboard
Nintendo's Switch Joy-Con repair process is (almost) a joy
How to fix Joy-Con Drift on Nintendo Switch – KontrolFreek
How to Fix Joy-Con Drift - Nintendo Switch Guide - IGN
Serious Drift: Using Nintendo's Joy-Con Repair Service – VIDEO GAME BOOK CLUB
Joy-Con Control Sticks Are Not Responding or Respond Incorrectly (responsiveness syndrome or so-called “drifting”), Nintendo Switch, Support
Nintendo will now repair Joy-Cons for free – even if your warranty has expired - Mirror Online
broken joy-con, could I fix this at home? : r/nintendohelp
How to Fix Joy-Con Drift - Nintendo Switch Guide - IGN