Yeah, I get where you are coming from. I had my BP living in his TUB for 3 years before I put him into his 3ft Vivarium.
I think your main problem, may just be not having enough clutter. My advice would be to get a more secure hide one entrance/exit, some plants or just anything to clutter the terrarium up a bit more, it will make your BP feel a lot more safer. Once you have done this try leaving him alone for a week, see how things go from there.
Some old photos, but this is how my BP lives, logs for him to hide in covered by plants and also two identical snug hides.
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