I am answering the astute question at the end of the OP, namely :
If I have no desire or feelings toward God, how can I "turn that on" by command?.
Jesus states the 'first and great commandment' as follows :
Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. [Matthew 22:37 KJV.]
And he also states the second :
Thou shalt love thy neighbour as thyself. [Matthew 22:39 KJV.]
The law commands love. It is right to love God and it is right to love one's fellow men. Why should one not do so ? It would be illogical not to love God who gave one's existence to oneself. Who presented to oneself such immense possibilities, now and hereafter. Who gives not only a momentary existence, but an immortal soul. Why should one not love him in response ?
And this is the work of the law that if 'I have no desire or feelings towards God' the law, by its command highlights the discrepancy and condemns oneself for the lack of what ought to be there and what should be there.
This is the work of the law in the heart of which Paul speaks in Romans 7, I was alive without the law once but when the commandment came, sin revived and I died (verse 9). Paul found that the requirements of the law, its rightful and proper commandments, resulted in this condemnation of himself :
In me (that is, in my flesh) there dwelleth no good thing. [Romans 7:18 KJV.]
Paul tried to 'turn on' his flesh by means of law. And Paul documents the experiment (a failed experiment) in Romans chapter seven.
Paul's conclusion and remedy to the situation is documented throughout the rest of his epistle to the Romans and his other epistles to those Christians in various places who voluntarily chose to follow Paul's teaching.
Love is of God [I John 4:7 KJV.]
says John the apostle. And he further adds, in the same verse :
... and every one that loveth is born of God.
And Jesus tells us :
Ye must be born again. [John 3:7 KJV.]
Else, we will not be born of God and else we will not love God, for love is of God and in me (that is, in my flesh, overseen by law) there dwells no good thing, such as the love of God. It is just not there, in flesh and blood.
Nor can it be 'turned on' or 'worked up' or 'prompted' for it is just not there. One can, of course, pretend it is there and one can squeeze out a tear or exert an emotion or cobble together appropriate words. But it is just an act, if the love is really not there in an abundant fountain (as it should be and as the law demands that it ought to be)...
... to fear the Lord thy God and to walk in all his ways and to love him, and to serve the Lord thy God with all thy heart and with all thy soul, [Deuteronomy 10:12 KJV.]
But to those who are 'justified by faith' and have 'peace with God through our Lord Jesus Christ' (Romans 5:1) Paul gives various exhortations ... for they are able to respond to his exhortations ...
...because the love of God is shed abroad in our hearts by the Holy Spirit which is given unto us. [Romans 5:5 KJV.]
Freely, to the justified (by faith) is given the Divine Person of the Holy Spirit who, in turn, sheds abroad abundantly the love of God within their hearts . . .
. . . for love is of God.