ECC + Zfnd are doing the most helpful basic building block technically by providing open source libraries and code. ECC also does regular outreach to check on compliance concerns and we engage with regulators so that we learn from both sides of that conversation and we provide clarifications to both parties.
Aside from advocacy and building tools, anything that makes shielded ZEC more financially attractive might spur adoption. One example is the early work Zfnd + Cosmos Foundation have done on a Cosmos Zcash Pegzone.
That design allows user to stake shielded Zcash in the pegzone and it also only supports transferring ZEC from the main chain to the pegzone through the shielded pool. If wallets or exchanges want to support those cross chain transfers or staking for their users, they’d need to upgrade to support shielded. We’ve seen exchanges adding staking support on behalf of users elsewhere, so I believe that’s an incentive that might make sense to their bottom line.