Hello everyone,

I am hoping to get some help related to my kumquat tree. I bought it a
few months ago, it was perfectly healthy, with lots of leaves and
fruits on it. I am sad to say that now it looks very different (see
photos) and I am afraid to do anything as I know they are really
sensitive and I never had a kumquat tree before. It is kept in room
temperature, with enough sunlight, and I am sticking to watering
instructions ("dig the soil up to half of your finger and if it is still
wet, do not water"). A while ago all the green leaves started drying
and falling out. I read this is something that normally occurs at this
time of year, but I do think there is something seriously wrong with it.
The problem is, I am really not aware of anything that might have lead
to this. The only thing I can think of is that once I saw a slug in the
pot and removed it. I could never find another one, but finding shiny
traces on the surface of the soil I was advised to dilute 1/2 vinegar in
2/3 water and pour in, which I did. I have never seen anything else,
but it seems that my plant is stagnating, or dying.
I would very much appreciate any advice about why this might be happening and what might be the best course of action.

Thanks in advance for all your help.