FIrst I would recommend to include an imperfection (noy only via the prestress), so say a half sway (sinus along beam).
What I would recommend is that you run first without prestress and only for 1 mm - just to see that it solves.
(also change the orthotropic - you only need EX, PRXY for isotropic)
If that runs then convergence comes from buckling.
So you would like to use perhaps stabilization (see stabilization command), and/or transient with quasi static option (tintp,quas).
ALso one can start taking away the plasticity to see what effect it has - if it is away and it is still not converging then it is due to the buckling.
Finally I would recommend doing this mechncial not in apdl as it is much easier to troubleshoot.
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