Hey D.R.G,
We would recommend using YEP Battle Engine Core and YEP Standard Turn Battle (STB) system plugins for this purpose. That will make it such that you can queue force action Turn Ends and that all the Turn End triggers happen after the Actor has completed their Action. Place these plugins above IsiahCardGameCombat for best compatibility. Once both of these are in, you should be able to use an Eval Card Action or an Action Sequence to fire a skill end the user's turn if their Action Count is reduced to 0.
If you are still having trouble implementing this system, we would be willing to troubleshoot it further with you on our community Discord. We have a dedicated forum by which we can help users with such implementation problems that may be easier than using the ones on itch.io. If however, you would prefer to continue the discussion here, we can do that as well :)
Thanks,
MythAtelier Team