Hard
I think you are being way too hard on yourself, cut out group submissions and get your card workload back to a normal stress free level because you are supposed to enjoy the hobby!
Losing cards from time to time is just part of collecting and yes it does suck. I recently developed a box with some dividers that helped me organize a bit better so fine-tune a system that can help you keep things the way you can remember / verify cards as they come in and then leave
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