Nowadays, Liopleurodon has no value. Even though it gives a good boost for deep sea loot crates, there are creatures that can help you get much better loot from other sources at a better rate, and permanently.

Honestly, it needs a TLC (should've been one of the winners for the most recent charity vote).

Make it a permanent tame, but only allow it to give the buff every 48 hours or so to keep it balanced. Doesn't need any other changes, really. Maybe a saddle? I heard it can use Meg saddles, but I haven't tamed one in years so I can't confirm the validity of it.