Sometimes starts sometimes doesn’t at all replaced starter and battery already

It's important to check and verify that the battery is fully charged and able to handle a load. If you verify this is the case and there is no response, then it's important to check for battery cabling to ensure it is clean of corrosion and secure. When the problem is actively occurring, it's time to check all connections and all proper operation of the starting system. Also, if automatic transmission equipped, ensure the vehicle shift lever is securely in "Park" position. If manual transmission, ensure the clutch switch is engaged.