Hadhrat Mawlana Mohammad Taqi Usmani (may Allah preserve him) said

‘Your heart should be always busy with Allah, either asking Him for something or thanking Him for a blessing, or seeking forgiveness for a slip or seeking refuge from anticipated tribulations.

This is dhikr-e-qalbi.

It is a very simple and doable things that leads to the development of a strong permenant relationship with Allah (ta’luq ma’ Allah).’