Our avocado tree came with a little stake to support it, but it wasn't quite up to the task. Some time ago, so we got a larger stake to replace it. The tree was floppier than I thought, so the single new stake wasn't cutting it. We stuck the old little stake in to help, but it was time to do something better.
We acquired (completely legally) a slightly used, very long stake, and after some time with the dead blow hammer, we were able to support the tree higher up and really stabilize it.