Crowns before fixing an overbite for esthetic reasons? Lips look thinner.

I had a nice smile but my teeth were crooked on the bottom. Top teeth were discolored with 2 crowns. So, I found a good deal on porcelain crowns with root canals and got 4 on top and 4 on the bottom for $200 each, but they are small and square on the top. My bottom lip gets tucked under top lip with my overbite which feels worse now. I read on here that an overbite should be fixed prior to getting crowns. Is it too late? I wish I had my wide smile back with fuller lips.