I would think its about time for your learning to begin by watching those "tools + aids" you keep referencing.
I have said before, not sure which thread of the numerous conflated threads, the bearing MUST have a press fit on the rotating part with a slip fit in the stationary part. This is common ball bearing install.
Now, if you cheaped out and skipped replacing the worn out input shaft, then the bearing would NOT have a correct fit on the shaft. This will definitely kill any bearing, even the best bearing made.
So, was the input shaft replaced? If not, then no surprise the bearing is trashed again.
Just keep driving it. Might be the best path to put this poor ride out of its misery.