Pleeease, let the new venture not be lithium! That market is...

Pleeease, let the new venture not be lithium! That market is saturated with hopefuls. Graphite has more potential but also controlled by Beijing along with rare earths and also in doldrums. Uranium is the current market darling but lead time to production is probably the worst of all minerals and they cannot afford anything near term now, DTR did a take-five and bought into strontium - that is different, but apparently a critical mineral in the USA.
Phosphorus, as in phosphate - never goes out of fashion, so long as we have farmers growing things (even BHP like it). Need heaps and heaps of it to make any profit of course.
Sewage - now there is a completely renewable resource also providing high demand minerals like nitrogen and phosphorus in an organic medium (think Green to win).
Maybe helium will grab attention. There is a company on the ASX specialising in finding this stuff and the Chinese are not onto it yet.