It appears that the LCOE for utility-scale solar which you're referencing here, community and rooftop both being significantly more expensive, is based on existing installations. But existing installations would have used the cheapest available land, and the cheapest available land tends to be in short supply. Solar installations on a significantly larger scale would have to use less ideal land (less accessible, more rugged, more expensive) and would incur associated cost increases. Solar is like a huge orange tree where we have been mostly picking from the lower branches — there are more than enough oranges on the tree for everyone, but you can't expect them all to be as easy as the low-hanging fruit.

However, I am optimistic about storage, particularly since zinc-bromine seems poised to break into the market, with excellent resource availability. Zinc production is about 13 Mt/yr [1], and the battery offers about 67 Wh/kg, with ~1/3 the weight in zinc, so 200 Wh/(kg Zn), so potential production is over 1 TWh/year before running into availability problems. There are also about half a billion tonnes of bromine in the Dead Sea alone [2]. (Since this is my third Zn-Br post, I'll add that I don't currently have investments in them, but I'm considering it.)

1: https://en.wikipedia.org/wiki/Zinc#Production

2: https://en.wikipedia.org/wiki/Bromine#Occurrence_and_product...