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This article will give you information on the care of these: https://www.gardeningknowhow.com/ornamental/trees/lychee-tree/growing-lychee-trees.htm

Hi Angela; I am sending you a link to an article on propagating lychee. Notice that growing from seeds is the least effective and predictable method. You will get a tree if all goes well, but you will not necessarily get the fruit you expect.

"You could also grow them from seed, but trees can take more than 10 years to bear and fruit may not be true to the parent."

Read more at Gardening Know How: Methods Of Lychee Propagation: How To Propagate Lychee Trees https://www.gardeningknowhow.com/ornamental/trees/lychee-tree/lychee-tree-propagation.htm

Lychee is not a large growing tree, but it will do best if given enough space to put out an extensive absorbing root system.
The roots are not likely to damage a substantial concrete house foundation, and it won't grow large enough to over hang the house with hazardous limbs or top. But I would recommend planting it at least 8 to 10 feet away from the house wall so that you don't have to worry about roots, or branches rubbing hard against the wall and having to prune it back hard.

All leaves turning brown and shedding in the summer indicates possible severe water deficit/drought stress. You may not have watered adequately during the hot dry season, which was extreme in your location this past summer.
Physiological stress like this can affect fruit development.
Good soil fertility and water management is vital for growth, flowering and fruiting.

Fertilize spring and fall with a complete organic fertilizer like this:
https://www.domyown.com/dr-earth-organic-all-purpose-fertilizer-p-9485.html

Deep water once a week. Try to achieve a water infiltration depth of 6 - 10 inches. (drip emitters or light sprinkling of the soil surface is not enough. Mulch the soil surface with at least 2" of organic matter to help retain soil moisture.

Here's an article with some more tips.
https://www.gardeningknowhow.com/ornamental/trees/lychee-tree/growing-lychee-trees.htm

Hm... It doesn't appear to be fungal disease. What I'm seeing appears to be severe nutritional deficiency. This can happen with old, used soil as well as soils with a severe pH imbalance. Testing the soil will be the first step.

These two articles will help: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm

Once you find out the fertility, and pH of the soil, you can begin to add what is missing or correct the pH.

The other alternative is to use a high quality soil with compost in it. Feed this soil once per season at the very least.

This article should help:

https://www.gardeningknowhow.com/ornamental/trees/lychee-tree/lychee-leaves-turning-brown.htm