Does anyone know how to fix ear buds?

How broken are they?

>>55227281
The left earbud doesn't produce any sound.

Buy new ones. Earbuds use notoriously thin cables and are completely not worth repairing. You'd need a good soldering iron, steady hand, a solid dash of experience and some heat shrink tubing to get even a shitty fix.

If the ear bud itself is broken you'll need to be a microsoldering pro, but then you wouldn't be asking this question.

Get proper IEMs (in-ear monitors). If you're really too poor to replace them, you'll still need a soldering iron to fix them (which I guess you don't have)