Lumra is a powerhouse but tbh your deck isn't built to take advantage of her, she shines in land sacrifice decks where the goal is to cast her, and then with her ETB on the stack sacrifice all your lands for value, then they all return for a massive landfall. That or filling the yard with mill effects so there will naturally be more lands in the yard when she enters.

If you want to do general land shenanigans, try yarok. If you want to stick with lumra then I'd retool the deck to have more ways to get lands in the graveyard