Sayyidi wa sanadi Hazrat Moualan Mohammad Taqi Usmani sahib (Allah SWT preserve him and allow us to benefit from him abundantly. Ameen!) wrote to a aspirant seeking islah (self reformation);
To prevent one’s self from the slightest tinge of bukhul/miserliness (a devastating blame worthy moral trait) make it a habit of giving in charity a fixed amount each month. Regardless of how petty that amount may be.