How can one improve their worship and remain steadfast in Allah's command in an environment that lacks sincere Muslims who implement the teachings of their religion?

The worship of Allah is the ultimate purpose for the creation of humankind. The first step towards excelling in it is to achieve monotheism (Tawhid (definition)) and to shun polytheism (Shirk (definition)). This is followed by diligently observing the pillars of Islam (prayer, zakat (definition), fasting, Hajj) by learning their rulings, while also being keen on performing good deeds and maintaining a sense of Allah's constant watchfulness. Excelling in worship is one of the most important factors for maintaining rectitude, and it is aided by keeping good company.