Accept that you may never become a native English speaker, but that this is not the goal. Work towards improving your respective skills step-by-step over time. It is unlikely you will ever gain a 100% native English accent, but perhaps 90% would be enough. Keep your goals clear in your mind – e.g. with accent the main thing is to be understood by everyone and that means clear, standard pronunciation with minimal confusion between similar sounds. This principle also applies to your other English skills.
Fluency in English is a “percentages game”
