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An avocado tree grown from seed (non-grafted) can take 7 to 10 years to bear fruit, if at all. You can help by planting more trees, i.e., grafted seedlings.
Avocado trees have functional male and female organs in each flower. However, the flower may open as a male first, then the next day open as a female, and vice versa.

This article tells more: https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-tree-with-no-fruit.htm

This appears to be a fungal infection. This is usually caused by overwatering or the soil remaining too wet for too long. It also appears to have a severe lack of light. These are very light hungry trees. Indoors, they will require about 200 watts of horticultural lighting per ground pattern square foot of tree. This is the minimum to keep the tree healthy and productive.

Fixing the light quality, intensity, and duration will have to take priority before you could expect any recovery from this tree. Once you get the light situated, then you can begin to treat the tree. Fungicides containing potassium phosphonate should help. See more below.

https://www.gardeningknowhow.com/edible/fruits/avocado/indoor-avocado-plant-care.htm
https://www.gardeningknowhow.com/edible/fruits/avocado/treating-avocados-with-root-rot.htm

You can prune, but you will have to do this continually until spring. This may hurt the tree. What would be better will be to get a horticultural lamp of about 200 watts per square foot of tree canopy. This will keep the growth much shorter. Instead of getting tall, it will remain very compact and bushy. You can prune once to shape it before applying the light for the winter, but after this, it will remain compact.

Avocado trees are usually grafted onto a rootstock and sometimes a wayward branch will grow from the rootstock. You should be able to see where the graft is and if the branch is coming out below the graft.
If so, just cut it off at the base.

The first consideration is good drainage of water away from the base of the tree, if not planted in soil that drains well. Avocado trees are highly susceptible to "crown rot" if they stay too wet at the base. If too wet they can develop root rot and that would begin to limit growth and fruit production. Your volcanic soil should drain well and be rich in trace minerals.

Provide good soil fertility with plenty of compost mulch on the soil surface throughout the root zone (under the entire foliar canopy and a little further, but not up against the trunk). Fertilize with a slow release complete organic fertilizer or well aged/composted manure in spring and fall.

This article has some good tips on growing avocado, the soil fertility and water management will help with flower and fruit production.
https://www.gardeningknowhow.com/edible/fruits/avocado/avocado-tree-growing.htm

https://www.gardeningknowhow.com/edible/fruits/avocado/treating-avocados-with-root-rot.htm

It is listed as hazardous to human health, and residue can be detected within, and on fruits even after thorough washing. This will not be a safe option for your trees.

Unfortunately, this pest needs to be handled by a licensed professional. Handling this situation improperly will lead to compounding problems.

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