Q.lemon tree seed, zone 8 TX
It’s overwintered in bathroom and 8 months old. I fertilize w/fertilome for citrus (1 tsp) and organic fertilizer spray on leaves (ladybug). When it was younger, leaf damage from overwatering. I pinched new growth from top, which produced 2 new limbs and pruned a couple leaves. I would like to know if top will grow back?

No, the top will not leaf out again.
Let the seedling grow freely, unless you have a branch that strays or you are trying to maintain a certain shape.
https://www.gardeningknowhow.com/edible/fruits/lemons/propagating-lemon-seeds.htm
https://www.gardeningknowhow.com/edible/fruits/lemons/how-to-grow-a-lemon-tree.htm