It is best said by Ibn Al Qayyim
The keys to the life of the heart lie in
• reflecting upon the Qur’an,
• being humble before Allah in secret,
• and leaving sins.”
The Quran , The Quran The quran!! Reflecting on it , pondering over its meanings , and Asking Allah to open our eyes , ears , hearts and chests to the Quran , Really a person with a hardened heart reads the quran and a person with a pure and soft heart reads the Quran and the way the second one benefits from it is not like the first one , the second one comes out of the Quran with new guidance , new hope , fear and aims , come out with the LIGHT and more Imaan.
Lots of lots of repentance and being humble before Allah , seeking forgiveness a lot n asking for the hidayah a lot.
Leaving sins ,
Whoever leaves something for the sake of Allah , Allah will replace him/her with something better.
Leave sins , no matter how small for the Sake of Allah n He will bless u with something better , The sweetness of Imaan , the peace and satisfaction of the soul.
It is said that love of Quran n music can never be joined in one heart.
Its about the heart really , i will suggest you read some of Ibn Al qayyims works , Love his stuff, may Allah have mercy on him.
If you can understand arabic there are two great tapes by Sheikh Salim Al Ajmi from kuwait(available free online). The reality of this world , n the plesure of Obedience and the punishment of disobedience.
He mentions in it that the biggest affect of our sins and negligence is that Allah takes away the Pleasure we feel in worship and good acts away, so we pray but dont find any pleasure/peace and satisfaction , we make dua but dont get any pleasure out of it , its coz of our sins ,
Like ibn taymiyah says
In this world there is a Paradise, whoever does not enter it will not enter the Paradise of the Hereafter. (Ibn al-Qayyim, al-waabil, p.69) that is the paradise of obedience
n he also said :The one who is (truly) imprisoned is the one whose heart is imprisoned from Allaah and the captivated one is the one whose desires have enslaved him. (Ibn al-Qayyim, al-Qaabil, p,69)
In this world, man finds remembrance of Allaah, praising Him and worshipping him, a delight that is incomparable to anything else. (Minhaj as-Sunnah, 5/389)
Sins are like chains and locks preventing their perpetrator from roaming the vast garden of Tawheed and reaping the fruits of righteous actions. (Majmoo-ul-Fataawaa, 14/49
leave something for the Sake Of Allah , a gap will be creadted in your heart with the departure of that thing , fill that gap with the remmberence and love of Allah.
Leave something for the Sake of Allah ,
By no means shall you attain Al-Birr (piety, righteousness, etc., it means here Allâh's Reward, i.e. Paradise), unless you spend (in Allâh's Cause) of that which you love; and whatever of good you spend, Allâh knows it well. Surah Aal Imraan verse 92
We will never taste Imaan, piet , rightousness etc unless we spend from what we love , its not just limited to money and other things , even though that is first , but also to our desires , our wishes etc n lusts.
N may Allah reward you and bless us all with the sewwtness of emaan.
Assalam o alikum wa rahmatul lahi wa barakatuhu