After changed a new printhead there is air so please wait some time to let the ink flow in then clean 2 to 3 times will be done. If still can not work please check whether there is air in the ink tube or ink cartridge.
Except printhead while ink pump also is the part that will influence the print quality. After you have changed a new printhead still have not improved the print quality while you may also need to change a ink pump.
If you do all maintenance still print blank then the problem is with the mainboard. Please check this video to see whether your mainboard can be repaired or need to change. https://www.youtube.com/watch?v=0T4b2KnhqVA
The DTF printer is complicate so it is better that you can find a technician to help you to do the maintenance.