The crude oil export ban was silly when you allow for the export of refined products. The true beneficiaries of that policy were US refiners who could buy US produced crude at an artificial discount and then export gasoline/diesel to Asian/European markets. As someone mentioned above, allowing the export of US crude actually reduced worldwide pricing and brought Brent/WTI closer.
For offshore leases, any new leasing activity wouldn’t result in production for many years. It takes years to explore and develop a greenfield development. Also it’s extremely expensive unless you can utilize existing infrastructure.
Capital is available for drilling but capital discipline is here to stay. If the companies tried to grow significantly, their investors would revolt because they want to get paid (probably for the first time since the shale boom started). Also, there would be significant services cost inflation if growth started which would shrink margins significantly.