Darjat is your level and place in society social hierarchy. In Islam whoever good and practice Islamic in their life shall be lifted off their Darjat to Allah. That you shall never know until your afterlife. All you can do now is assumed.
How your Darjat in society? Who decides who is better? Which job have better Darjat? How do you get better Darjat?
People around you decide your Darjat. An Iman will be respected in his qariah but if you put in around atheists they shall put nothing. A mob boss for sure will have good Darjat in prison compare to goody people.
What if you decide you have higher Darjat than others? People will get irritated.
To have better Darjat you shall make good deed with other, carry yourself with class. Then, you carry a different atmosphere around you.