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Don't give it more water just because it looks sad - most of the time the problem comes from waterlogging or poor light. Check that the soil drains well, that the pot has drainage holes, and move it to a brighter spot: gasteria doesn't like being in the dark and suffers if it stays wet too long.
One thing people forget to check is whether the roots are actually compacted in the pot - gasterias have small roots and sometimes they literally stay stuck to the original soil when you buy them, and they can't expand. Try repotting with much sandier and fattier soil (like 50% sand, 30% peat, 20% perlite), and when you take it out of the old pot gently loosen the root ball with your fingers - it shouldn't be a solid block, otherwise it has no room to breathe and it won't grow at all.
How many months exactly, and what light conditions were you keeping it in before?
Gasteria is a succulent that hates drastic changes. If you've recently moved it from a brighter spot to a darker one, or vice versa, it could be stressed and stuck for weeks. Try putting it in a window with stable indirect light - not direct sun, but not in a dark corner either. If it's been in the same spot for months without growing, then the problem is almost certainly drainage or the root-bound issue that others have already mentioned.
One detail that changes everything: gasteria in pots for a long time often develop roots that curl in on themselves without expanding. It's worth repotting it with fresh, well-draining soil mix (standard succulent mix works great), even if it looks fine already. After repotting, wait at least two weeks before watering again, so the roots can settle in without rotting.
ilaria1986 asker
I moved it two months ago to a shadier spot because it was getting too much direct sun and the leaves were turning yellow.
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