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I was given a ficus ginseng bonsai quite a while ago (2 years ago I think?) and I'm having trouble keeping it healthy: it never grew, it doesn't feel firmly rooted, it doesn't have a lot of leaves (kinda like this stock photo) and the few it produces immediatly fall when they reach their full size.
It's potted in a regular flower pot (17cm ⌀) with store bought bonsai soil, I use regular fertilizer sticks from time to time and I wait before the soil is completely dry to thoroughly water it. I also wash the leaves from time to time when they get too dusty.
What am I doing wrong?