Red...you have several options. You can top it and hope for the best. During growing season they will often sprout new growth very quickly. However, I am concerned about your knowledge of ungrafted fruit trees. Even though you are setting fruit...the chances of getting quality fruit is remote. Getting a Brogdon type fruit might be in the 5% range because of being a seedling. . Would you consider topping and grafting (bark graft) a desired variety on top? If you do that...it will take off because of the established root system.

Agree with Fireduck (and love your name, by the way). Since it came from seed the likelihood of the fruit being good is slim. You do however have a strong, established root system, so grafting a Brogdon, or whatever your preferred variety (or two or three) to your trunk would likely yield much higher quality of fruit, and very quickly.

This will be the second year I get fruit ....The fruit looks like brodgon but is definaltly lower quality as the seed it came from ...

I would consider anything to get good avocados on a tree at a height I can easily manage

So cut it back , let it sprout and graft on new wood ?

Where do I look for more information on a bark graft you mention

TIA

red....cut it down to about 18 inches or so. At that point you can bark graft (google that) or you can wait for new sprouts to appear and whip graft (google that) next summer. Bark grafts are a little more difficult to take. You can research a local person who can graft for you. It depends on your level of interest. You definitely can do it is you do your research.