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Have you thought about seeing a psychologist or even a psychiatrist? It could be a symptom of some mental disorder like ADHD, where you have trouble concentrating on a task and completing it.
I have difficulty with perseverance too, but I've found a solution to this problem. If I find it difficult to study on my own, there are online tutors with whom I'll study English https://promova.com/online-english-tutors regularly according to the syllabus. Finding an experienced tutor now will be more than quick, but it will be many times more effective than self-study.
Have you thought about seeing a psychologist or even a psychiatrist? It could be a symptom of some mental disorder like ADHD, where you have trouble concentrating on a task and completing it.