Does reverting to masturbation and watching forbidden sites after repentance invalidate the reward for Hajj?

A Muslim must repent whenever they sin, and they should not despair or tire of repeating it; for Allah is Forgiving and Merciful, effacing sins through sincere repentance. The reward for Hajj and good deeds remains and is not lost, and one who repents from a sin is like one who has no sin. A Muslim should ask Allah for success and assistance, associate with the righteous, avoid the wicked, strive in supplication, remembrance, and seeking forgiveness, stay away from the causes of sin, occupy their time with what benefits them in their religion and worldly life, and frequently observe voluntary fasting.