Asalamualykum dear brother/sister,
I guess you need to do some self analysis. Understand what's stopping you from being good. Every time you commit a sin, commit a good deed straight away. Every time you treat someone badly promise yourself you will do something that you hate but which is halaal for example, giving x amount to charity, donating x amount of hours to volunteering etc.
Continue speaking and asking Allah swt for help in this matter especially during the times where duas are more likely to be accepted. If your parents are alive ask them to make dua for you.
Assess your environment, friends, do you have halaal income coming? Do you eat halaal food? Do you lower your gaze when required? Do you speak the truth, avoid swearing, backbiting etc. All these factors can play a part.
Remember death often. Visit the graveyards often. This should change you insha Allah.