Success is achieving what you set out to do.
For most of us it's probably either the cathartic effect of sharing our thoughts with others, or to make money.
Everything else is either noise or an
indicator of how you're performing.
A high DA isn't really a success. But the profit from paid blogging which is dependent upon having a high DA probably is.
Being top of Google isn't really a success. But people finding your work more easily probably is, if you're in it for the social side.
It can be a long road to success. You can still have fun and make money on the way