The reality of Tasawwuf has been described as,
“Sincerity in turning to Allah, exalted is He, with that which pleases Him and in the way it pleases Him.”
The Adab of the True Seeker, page 22-3
In addition to sincerity, special attention is to be paid to the phrase, “in the way it pleases Him“. All actions done as per the Prophet’s manner (Sunna) are for sure guaranteed this pleasure. While, none of the innovated ways carry this assurance.