[Running] com.macpaw.CleanMyMac4.Updater.plist (MacPaw Inc. - installed 2019-10-14)
You still have a CleanMyMac Launch Agent running even though it seems the rest of the app is not installed:
If you still have problems after removing this Launch Agent, then run DriveDX and post the report here using the "Additional Text" icon which looks like a piece of paper. DriveDX also has the ability to run the SSD's internal self diagnostic if the SSD supports it (only the short test is available during the trial period unless accessed from the command line).
Check to see if the SSD has any firmware updates available. This can be hard to do as many SSD vendors do not report firmware revisions/updates since many rely on a Windows only app to check and perform SSD firmware updates.
TRIM is not enabled which could explain the issue during the write test. You can enable TRIM using the Terminal app:
sudo trimforce enable
It looks like this SSD is a decent one from the limited information I could discover on its technical specs.
You can uncheck "Put hard disk to sleep when possible" located in the Energy Saver System Preferences. Unchecking this option allows the SSD to retain power so it can perform critical maintenance and Garbage Collection whenever the SSD (and laptop) are not being used. This can be important if TRIM is not enabled.
In the mean time you can also Option Boot the computer by holding the Option key just after powering on the system and let the computer sit at the Apple boot picker menu for several hours which will allow the SSD to perform internal maintenance and Garbage Collection similar to what would occur when using TRIM.