Some autist made a three-part (now put together into a convenient single video) review going over how much character assassination and retconning happened to justify the plot. For instance: Woody was absolutely willing to abandon his family and Andy to join Bo Peep in the box when she was being given away. That's in the
prologue of the movie.
The TL;DR is the director (who had never directed a Pixar movie before) threw out about 75% of the original script once Lasseter was kicked out and sabotaged the film to destroy his legacy while claiming to have always been a huge fan. After he won the Oscar because the Academy is paid off by Disney, he fucked off from Pixar.
That's why fixing it with a sequel
no one asked for is a herculean challenge. How the fuck do you make it convincing without being obvious you are trying to make the previous movie non-canon? I don't know if any fanfiction exists that was able to pull that off.