It's important to turn things down.

Hi?

When someone asks you to do him/her a favor, which you can't handle,
you inevitably say 'No'.

Could you lend me some money? No.
Could you take care of my dogs while I am on my vacation? No.

Now, can I say,

A - 'It's often important to turn things down, because we can't do it all.'?

Wondering if 'turn things down' can refer to 'reject in general',
I searched Google to see a very small number of cases where it's used.

If 'turn down an invitatin', 'turn down the offer' and 'turn down the suggestion' make sense, 'turn things down' also should make sense..
Not really?

Could you please tell me if sentence A sounds okay or awkward?
Thank you.