Have you tried recording yourself speaking English? Personally, this helped me a lot. If you have trouble hearing whether your pronunciation is right or wrong while listening to your recording, it could help to listen to an English speaker, record yourself saying the same thing, and then compare it. Best to start with short sentences.
Otherwise, it could be helpful to analyse yourself: Where are your weaknesses? If you know your weaknesses, then it's much easier to work on them. If you struggle to find them on your own (it can be tricky sometimes), maybe someone else can help you. 😊