One of the areas where diversification is most needed is agriculture.
There are many thousands of plants, some say 10.000, which gives edible and non-edible material to humankind.
And there are also many animals as part of the food chain and which provide by-products.
Examples of non-edible can be cotton, tobacco, wood and roots/bark, animal skins, furs and bones, plant extracts.
And there are many with high selling price: porcini mushrooms, truffles, Siberian kiwi, acerola and kakadu plum (extremely high vitamin C contents), pine nuts, waygu meat, wools(cashmere, alpaca), some flowers, spices (saffron), essential oils and plant extracts(e.g. bergamot), seafood
There are also many very niche products: donkey milk (used in hospitals for new-borns with milk allergies/rejection), ostrich eggs and meat, buffalo milk used for mozzarella, trumpet zucchini which vine vertically and giant onions up to 2 kg which grow on horizontal nets above ground, essential oils of many plants
Each of the thousands niche products of agricultural goods and derived products can be worth millions and provide excellent profitability and jobs for farmers, while staying away from commoditised mainstream products where competition is very high and selling prices low.
Obviously agriculture should provide food security inprimis, both as cheap and easy access to nourishments and as a state security itself.
But there are many opportunities for enterprising people to carve out a niche to thrive. I believe that we are in an era, where often investments are made for "innovative start-ups selling Chihuahua pet food", but too little money flows into agriculture, where there are still many opportunities to be found.