How can one repent, pray, fast, learn their religion, memorize the Quran, and guarantee God's satisfaction upon death, especially if they cannot find someone to teach them the matters of their religion?

To repent, you must abandon sins, sincerely regret what has passed, resolve not to return to them, and restore rights to their owners if there are any. Avoid bad company and stick to good company. Maintain the prescribed prayers in the mosque with the congregation, and attend circles of knowledge. Fasting involves abstaining from food, drink, and sexual desires from dawn until sunset, along with restraining the limbs from disobedience. Seek help from a shaykh to memorize the Qur'an and learn correct recitation. Let your hope in Allah be great, and do not despair. Drawing closer to Allah is achieved by performing obligatory duties, avoiding prohibitions, and increasing in supererogatory acts.