Planting a cover crop of some kind....Maybe a vetch or other nitrogen-fixing plant....The roots and tilled-in plants will add OM. You might also start burying your kitchen waste in the garden ...in your heat, it should cook down pretty fast. If you have a shady corner in the garden, how about creating a worm pit? Will take kitchen waste and even garden waste and enrich the soil. My in-ground worm pit goes year around, here.

Adding organic matter is, usually, never a bad idea, cover crop, heavy mulches (if materials are readily available). However now is also a good time for a good, reliable soil test (if not done in the last 5 years) as well as these simple soil tests,
1) Structure. From that soil sample put enough of the rest to make a 4 inch level in a clear 1 quart jar, with a tight fitting lid. Fill that jar with water and replace the lid, tightly. Shake the jar vigorously and then let it stand for 24 hours. Your soil will settle out according to soil particle size and weight. A good loam will have about 1-3/4 inch (about 45%) of sand on the bottom. about 1 inch (about 25%) of silt next, about 1 inch (25%) of clay above that, and about 1/4 inch (about 5%) of organic matter on the top.

2) Drainage. Dig a hole 1 foot square and 1 foot deep and fill that with water. After that water drains away refill the hole with more water and time how long it takes that to drain away. Anything less than 2 hours and your soil drains too quickly and needs more organic matter to slow that drainage down. Anything over 6 hours and the soil drains too slowly and needs lots of organic matter to speed it up.

3) Tilth. Take a handful of your slightly damp soil and squeeze it tightly. When the pressure is released the soil should hold together in that clump, but when poked with a finger that clump should fall apart.

4) Smell. What does your soil smell like? A pleasant, rich earthy odor? Putrid, offensive, repugnant odor? The more organic matter in your soil the more active the soil bacteria will be and the nicer your soil will smell.

5) Life. How many earthworms per shovel full were there? 5 or more indicates a pretty healthy soil. Fewer than 5, according to the Natural Resources Conservation Service, indicates a soil that is not healthy.

Together these steps will aid you in making the soil you have into a well balanced soil that is good and healthy.