I was setting my website and during this by mistake I clicked at the button

Hi,
I was setting my website and during this by mistake I clicked at the button Default Setting which I don’t want to do by purpose. I want to click at Save settings button but by mistake I clicked the Default setting button.
Now, I have lost all my old data which was near the an end. I am very upset that after doing day and night work I lost all my work.
Please let me know that is there any way to get back that data ?
I hope, you would guide me properly.
In the attachment, you can see the colored button (Default Setting).

Waiting Patiently for your reply.
Thanks