Is it permissible to commit suicide by painless methods, especially when a person suffers from a psychological illness (autism) that renders them unable to cope socially and professionally, and they fear that the noble Prophetic حديث about suicide applies to them?

This world is a place of trial, and illness is one form of trial. A Muslim should seek treatment, submit to God's wisdom, and not despair of His mercy. Suicide is forbidden in any form. Therefore, it is not permissible for one afflicted with depression or pain to commit suicide, as a servant does not have the right to dispose of himself without God's permission. One must avoid despairing of God's mercy and increase in supplication and obedience, for indeed, after hardship comes ease. It is advised to return to family or integrate into a righteous environment and consult psychiatrists.