The gains from GM crops are a lie[1] - most GM crops are made so agri-chemical companies can sell more pesticide for pesticide-resistant crops. Overuse of pesticides is killing all the insects and ruining soil quality.[2]
If you want to get more efficiency out of the food system you can easily do that by going vegan. Raising livestock provides just 18% of calories but takes up 83% of farmland. If you cut out meat you get 83% of the farmland back. You don't even need to cut out meat completely - just have a couple more meals each week without meat and you're saving many times more than any GM crops could achieve.
If you want to get more efficiency out of the food system you can easily do that by going vegan. Raising livestock provides just 18% of calories but takes up 83% of farmland. If you cut out meat you get 83% of the farmland back. You don't even need to cut out meat completely - just have a couple more meals each week without meat and you're saving many times more than any GM crops could achieve.
[1] https://www.ucsusa.org/resources/failure-yield-evaluating-pe...
[2] https://www.ucsusa.org/resources/hidden-costs-industrial-agr...