Q.Avocado plant w/brown tip leaves
I have an avocado started from seed that is about 2 feet high. It is still in water container, and the pit has dried out. The tips of the leaves are brown, and it has new growth. I know I should plant in soil but afraid that it will die. Can you give me tips on what I should do with it? I am not sure what size container to switch it to, and I really do not want to give up on it.

You should go ahead and plant your Avocado in a pot.
Here is a link that will help you.
https://www.gardeningknowhow.com/edible/fruits/avocado/indoor-avocado-plant-care.htm