Purposefully using “worse” (different) seed is a solution as crop rotation, cover crops, and allowing land to go fallow helps with soil health (and reduced erosion and runoff and waterway pollution…)

Maximizing yields through subsidized monocropping and biotech seeds is unsustainable resource extraction.

A lot of consumer’s buying habits for products with inelastic demand is driven by cost. If companies weren’t driven by ever increasing profits then there might be more of an incentive to offer a wider variety of crops to consumers. Certain crops are already subsidized by the government to make it profitable for farmers. If other crops were subsidized then perhaps farmers would be more encouraged to grow them and if people see these at normal prices they might also be more interested in buying them. Of course, this would rely on multiple parts of farming being overhauled. For example, there’s a lot of cost sinks, one I can think of is the locked down maintenance of farming equipment (once again driven by the need for increasing profits via fiduciary duty). Eliminating these and other overheads would not only lead to more cost efficient farming, but also cheaper crops and increased variety offered to consumers.