I made a terrarium, is there any advice to keep it alive? pics inside.

I recently made a terrarium in a glass aquarium with succulents and cacti. I didn't do much research beforehand and really don't want to repot it as I'm learning of the issue with humidity and drainage. The bottom layer is aquarium rocks, and the soil is just potting soil. They get a lot of light (in the picture you can see the window, I will be putting up curtains in five days but can leave them open). Does anyone have any advice on how to keep them alive without repotting?

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