How can one supplicate from the heart so that it may be answered, taking into account the whispers of Satan, fear, and overthinking, and are purity of intention, distance from sins and transgressions, and seeking refuge from the accursed Satan before supplicating influential factors in this regard?

Supplications are answered if the conditions are met and the impediments are removed, as Allah the Almighty promised. Among the reasons for the supplication to be answered is abstaining from sins, because they are among the impediments to the answer. However, this does not mean the absolute impossibility of the supplication being answered for a sinner. And the answering of the supplication does not necessarily mean giving the supplicant the exact thing he asked for. Rather, it is one of three: the supplication being expedited, or it being stored for the Hereafter, or averting evil equivalent to it.