Method 1: Heating up the platform can increase adhesion between platform and model.
Method 2: Adding raft to model when slicing in FlashPrint.
Method 3: Apply solid glue to the platform before printing.
Method 4: Use extruder calibration in expert mode or leveling calibration to reduce the distance between the nozzle and the platform.
Method 5: Make sure the platform is flat. Complete 9-point leveling suggested.
Method 6: Apply extruder calibration to reduce the gap.