The speed of my disk greatly decreased .

Sorry to say, none of the test results in your pictures show any big change in that SSD. The WEI score is 5.9 in all the pictures, the AS SSD results are almost identical and fine for that SSD, and the Passmark results look very good.

Don’t forget that the WEI disk score is based on all the disks in a PC, the more disks in the PC, the more one or more slow ones (HDDs) will reduce the score.