Feeling a bit hopeless with ADHD

I've been having major issues with focus for a long time now and I never really noticed or thought it was adhd because I wasn't hyper or super energetic as a kid. As I got older and had more trouble doing tasks and focusing on whatever I am doing, I wanted to see if I had a neurological disorder. I had gone to a psychiatrist and this psychiatrist recommended me an anti depressant as an off label medication to help. Overtime I felt this medication wasn't working for me and I wanted to try something else as I was really struggling. I then got prescribed vyvanse at a low dosage and I have been increasing the dosage by week and for some reason I still don't feel a major difference. I still have trouble starting tasks, and if I do happen to start them I lost motivation to complete them very soon. It's starting to affect my personal life in a bit of a negative way and I am feeling lost right now. It is super late at night when I am supposed to be doing work but instead I am typing all this lol. Does anyone have any suggestions on tips to start tasks and to make the medication effective. For some reason I just haven't been able to figure it out.