Can anyone help

First want type of Bonsai is this

I the bonsai sick

I have this Bonsai for over 6 months I look great the last three weeks it’s lost most of it leaves

What I am doing wrong

Thank you for any help

It's a dying grafted "s" shaped mallsai, an Elm.
Leaves indicate it's sick.
Positioning indicates it needs more light.
Soil indicates it needs less water.

Ah...
Take off the rusty wires.
They do nothing now to shape the tree and if they stay, they will help it to die faster.

I would also consider losing the watering tray. Judging by the looks of the soil, water retention should be the last of your worries. Check to make sure the soil dries slightly before your next watering. Although chinese elms have been extremely forgiving in my experience, you can kill them if you leave their feet too wet at all times. Lastly, I would suggest keeping this tree outdoors. It may scrape by for a year or two on a windowsill but without the proper dormancy and growth periods trees like this are meant to experience outdoors, they will die.

Could be also overwatering and soil staying soaked not draining out.