You can check out the Liquid block explorer its' pretty much a ghost town. If you have a lightning channel set up you're pretty much good when the high fee times come around

Some wallets are using Liquid to do lightning swaps into liquid on the fly via Boltz exchange like Marina wallet etc so that sometimes fills blocks You can rebalance channels with liquid too if on-chain fees is high

Liquid's main use was arbing between exchanges, but few support them