What is the solution to confronting the weakness of certainty in Allah that results from intrusive thoughts, despite reciting Surat Al-Baqarah daily?

The greatest remedy for obsessive thoughts is to turn away from indulging them, to seek refuge in Allah from Satan, to avoid being alone, to occupy one's time with a program that strengthens faith and mends one's relationship with Allah, and to associate with and sit with righteous people and participate with them in good deeds.