Well then here's a bunch of teardown images you can use for reference;

https://www.ifixit.com/Device/Joy-Con

The digital switch inside is very cheap just about everywhere online, so if you did want to replace it. It's not going to break the bank.

https://www.amazon.com/Tactile-Bumper-Nintendo-Controller-Replacement/dp/B07BFY9J1L/

If you're not experienced with soldering or repairs, check out local cellphone or tech repair shops. Replacing the button shouldn't take more than a few minutes.

The risk being if that's not the source of your issue, then you would have to replace the whole joycon motherboard. Which is basically just as expensive as buying a whole new joycon.