What is the way to get rid of evil thoughts that include insulting God, which reappear despite repeated repentance and feelings of remorse?

We ask Allah to remove these whisperings from you. We advise you to strive against them, to avoid giving in to them, and to seek Allah's help and supplicate frequently. If these whisperings attack you and you cannot control them, you will not be held accountable for them as long as they are not of your own volition, because choice is a condition for accountability, as confirmed by His Almighty saying: "And there is no blame upon you for that in which you have erred, but [there is blame for] what your hearts have intended," and His saying: "But only he who opens his breast to disbelief - upon them is wrath from Allah, and for them is a tremendous punishment." You must repel these whisperings and seek refuge from Satan.