The trouble with solar -> electricity -> hydrogen -> electricity and the like is that normal lithium ion batteries seem to do the job cheaper and better for most applications.
Building batteries for seasonal energy storage would require huge amounts of raw materials. Building hydrogen storage requires nothing because you can reuse salt dome caverns previously used for natural gas.
Note that at atmospheric (or any) pressure, the volumetric energy density of hydrogen gas is less than 1/3 that of natural gas. You would need 3.2X more salt cavern space to store the same amount of energy.