What kind of potting soil? Does your pot have drainage holes?

You need excellent drainage.

The pot has holes....and the medium is called mesquite soil, it is almost soulless, it basically dry leaves and wood chips. Could it be better if a plant it outside in the ground? Isnt it possible it is infested?

That might be a scale in the bottom pic. See if it peels off easily. One won't kill it, but it won't help either. If your climate is agreeable, put it in the ground. Remember, you will have to graft it to make it fertile. Young avos are temperamental. Make sure the soil is dry before watering. Bark chips might retain too much moisture.

The most likely cause from those brown/rolled leaves is that the planting mix got too dry for too long. Everybody is afraid of root-rot with avos...but the truth is: if you have free draining soil (or potting mix)...the avocado tree needs constant moisture. They love water! PS Never plant in a container with native soil.

Thank you Tim and Fireduck. The weather has been cold, I'm going to wait a little to plant it outside....I have plenty of space. The plant is doing worse....

I have been watering it every 3 or 4 days

Also, young avos need moderate sunlight only.

Those leaves are toast. No saving them.let them fall into the bucket for mulch.

I do see what looks like new growth.

if so, you still have a chance.

I planted it outside. I hope it does better.

Leaves looked like mine when I overwatered.