Hare Krsna Dear Gurudev,
    Please accept my humble obeisances at your lotus feet.
    All glories to Srila Prabhupada.
    All glories to Guru parampara.

    Gurudev, what else is required for me to do for awaking of 'Atma' other then (Good 16R of Japa, 4P)?

HpS - According to Srila Prabhupada, nothing, but don't fight it. Getting up at 4AM, doing Sankirtana, all these things will naturally follow from 16R, 4P.
    Why it takes time to awaking? What could be the root cause for delay?

HpS - Many factors. One is that we have been conditioned for so long so it takes time to recondition.  Other than that is because we don't want to go fast.

    Body attracts for Body very easily. Then why 'Atma' takes time to get attracted to 'Atma' / 'ParamAtma'?
    Why it is taking so much time.

    You are always at 'Atma' level that is why, you are always in KC at any Physical state. You very easily
    get connected with 'Atma / ParmAtma'. Your 'Atma' speaks.

your fallen servant,
Girivaradhari-Gopal Das

HpS - In Kapila's instructions to Devahuti he says that the attachment of the conditioned soul for the material body is very great, but if one hears about Him with great endeavor for a very long time, he can get free!   So we do it and we see progress at every step. Should see progress every day, every year, every Janmastami.