I have an avocado plant which has sat and grown happily (well probably not) on a windowsill in my flat for ~ 2 years. I paid it no attention except to water it occasionally when I noticed it needed it as it was left here by an old flatmate. I decided last weekend I wish to take better care of it as it looked like it wasn't doing so well, so I went to the garden centre and bought a new pot, soil and some filter type stuff and repotted the plant.
It has been a week since repotting and the plant looks very sad and thirsty. I read up about plant shock after repotting and was aware this would happen. But that after a week or so there should be some improvement, it only seems to be getting worse.
I repotted the plant as it was in a much smaller plant pot and the tips of the leaves had started turning brown which I read that probably means the soil of the plant has a concentration of salt in it that is too high. What's more I think the plant was just planted in soil taken from the garden which I also read is bad for an indoor plant. Repotting the plant disturbed the roots significantly. I cleaned all the existing soil from them (I don't know whether this was a good idea or not) by washing them in a bucket of water but did not trim any of the roots (as I didn't know to check for root rot).
I put it in a new, bigger, clay pot following advice from the garden centre with the following structure (sorry it's in german but the picture shows how it is set up).
Since repotting I have watered it a few days after repotting, letting the water drain through the soil as I read this should help the plant settle. The soil is moist to the touch and does not feel like it needs watering again but as you can see the plant does look thirsty. Should I water it more or not?
Is there anything I can do to help the plant recover and adapt to its new, hopefully better home? The plant is in a warm room with ambient daytime temperature of ~18 degrees celsius and is above a radiator next to a window. The window is east facing but this is not something that can be changed, nor can the plants location to another facing window.