Dota was a serious addiction of mine. What helped me quit was getting rid of EVERYTHING that could trigger me to play.
- Uninstalling Steam - Deleting twitch account - Every time youtube would recommend me a dota video, I would mark it as "not interested" and "dont show this channel again" - Getting rid of my mouse. I gave my mouse to someone for a month for safekeeping. - Finding another stimuli that you deem less damaging. For me this was chess.
Video games can cause extreme addiction I know, but successfully quitting it is SO REWARDING. After almost 18 month I do not miss it even a little bit.
What also could help is telling everyone you know friends and family that you are quitting this game. Then you will be less inclined to fail because they will know about your failure. Try to not be alone in this journey.
Good luck.