I actually have an avo tree taller than me that I started this way 10 or so years ago. It is in a pot, and our climate is a bit cold for them, so I move it into the house in winter.
These are normally outside, just hiding from the worst of the winter.
I tend to underwater, IME I’ve lost more plants from overwatering than underwatering.
It’s definitely something that happens to people often, but in your case you can clearly see the leaves hanging towards the floor. While indoors, I tend to water my Avocados when I notice the leaves starting to hang.
Of course, check the soil first. If you poke your finger in a couple centimeters and you can feel moisture, you can still wait a bit.
Could it just be a bit cold?
Unless OPs living space is constantly below ~15°C, it shouldn’t be an issue.
Oh i was just thinking like how rhododendrons droop their leaves in the winter,. If the avos could be doing a similar thing. But good to know!
Avocados originate from Mesoamerica where Winters are mild. They have no dormant period.