It's not that Krsna (God) has to personally appear to help us by waving some magic wand, it does not work that way, God appears in many ways through many others.

In early February 1973 in Sydney Australia Srila Prabhupada developed a serious infection on his finger from a paper cut while opening mail.

The infected finger got worse over a few days and eventually he asked us to bring him a doctor who would give him penicillin. We did this and the penicillin given to Srila Prabhupada healed his finger within a day.

One young devotee saw that Prabhupada was constantly chanting Hare Krsna, translating Srimad Bhagavatam's 3rd Canto and preaching to the devotees and therefore believed he would always be protect by Krsna.

So now this boy was confused, he could not understand why Krsna never fully protected his pure devotee, so he asked Prabhupada -

''You are always chanting Krsna's name, working late at night translating Sastra into English and preaching to the devotees, why didn't Krsna heal your finger that caused you some discomfort?''

Srila Prabhupada answered, showing great faith in Lord Krsna,

''Oh yes Krsna was so kind He immediately helped me! It was Krsna who sent the penicillin that healed my finger''.

It's not that Krsna has to personally appear to help us by waving some magic wand, it does not work that way, He may appear in many ways through many others. 

Krsna also wants us to contribute personal endeavours to achieve our very best as the individual jiva-soul we are eternally-

''God helps those who helps themselves'' that's the secret of spiritual life.