What should I do with the unfinished scriptures?

Put it in the study or bookcase before you finish copying it. ? Buy a big one next time. ?

After copying it, just collect it yourself. Think of it as the Tao Te Ching. ?

Don't burn, don't throw.

You like copying scriptures. I suggest you copy the Mahayana classics. That is, Buddhist scriptures. For example, the decision of the Puni Sutra, the Sangha Sutra and so on.