You can try three relatively easy methods to unclog a shower drain.
Firstly, get rid of any hair that might be residing in the drain, and pour boiling hot water down the plughole.
If that doesn’t sort out the problem, try using a combination of baking soda and vinegar to clear out the drain.
And if the drain is still clogged at this point, you have the option of using a plunger, plumber’s snake or a chemical drain opener to tackle the issue.