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I changed the thermal paste of my ps4 pro and now when I want to enter the game and I start to play the fan sounds forced and it accelerates and turns off by itself I don’t know what it is help me please

Check if all thermal pads are present for the memory chips on the board, along with the little plastic thing that goes under the 4 screw clamp. The 4 screw clamps should be facing downwards. Then on some models there’s an extra metal cover that has the thermal pads on it instead of being on the large metal plate that goes over the whole logic board. Make sure all of the black phillips head screws are screwed in around the vrm area. This needs to be screwed on the back plate and not the logic board. Refer to step 11 and 12 of this guide on the thermal pads for the logic board: PlayStation 4 Pro Motherboard Replacement