How can one properly embrace Islam in a way that guarantees entry into the Paradise of Firdaus, as Allah Almighty has promised?

For a servant to be among the people of the highest Firdaws (Paradise), he must believe and do righteous deeds, as stated in the Quran, and fulfill the religion within himself, as mentioned in the Hadith of Jibreel. Thus, he should implement the outward pillars of Islam, such as prayer, which must be observed in congregation. Furthermore, one must purify his creed from impurities, adhere to Allah's boundaries and obligations, and avoid prohibitions, in addition to acquiring beneficial knowledge and sitting with people of knowledge.