Sadly the Butterfly & Magic keyboards are not replaceable on there own! You need to replace the full uppercase assembly:
Presently we don’t have the 2020 (Magic) part info for reference here’s the 2019 model (Butterfly)
* [https://www.thebookyard.com/product.php?cPath=39_367_695&products_id=21889|13” MacBook Pro Upper Case/Bat/TP US - Space Grey]
* [https://www.thebookyard.com/product.php?cPath=39_367_695&products_id=21895|13” MacBook Pro Upper Case/Bat/TP UK - Silver]
Unless you did something major to your system I would recommend you get the system serviced by Apple or authorized service center hopefully fixing it under warranty or under AppleCare+ service contract if you had it.