Lightning is one way.

There are some issues with capital lockup costs, so other level-2 scaling solutions are also required. There's been more discussion of a Bitcoin bridge for Cosmos, as well as Ethereum. Tendermint sidechains is what crypto needs. Tezos recently announced plans Tendermint adoption, as well as Binance w/ the Cosmos SDK.

Disclaimer, I'm a longtime lurker & cofounder of Tendermint/Cosmos. Cosmos is coming.