Full Tummy Tuck After Mini Tummy Tuck? Any other procedures that can improve the appearance of my naval and skin around it?

I have performed full tummy tucks after mini tummy tucks and the key issue is level of the lower abdominal incision, the position of the umbilicus as well as the amount of upper abdominal skin laxity.
If there is insufficient laxity, then you may require a small vertical incision. 

Your question is a really good one and the bottom line is that you need to see an experienced surgeon in your area to determine if this is a possibility. If the lower abdominal skin is too tight, you may want to wait for the skin to loosen. Your other options to address the upper abdomen would be to go ahead with the full tummy tuck with the understanding that you may end up with an additional small vertical scar in your midline (your consulting surgeon can go into more detail as to why this may happen, but basically this would be the incision in the skin where your belly button used to be) or you may be a candidate for a reverse abdominoplasty, where the skin is pulled up and the incisions hidden in the crease of each breast. I would use a lot of caution with choosing this procedure, and I think in my opinion it is better for folks who already have those incisions present on the breast, say from a previous breast reduction.
Hope that helps, but definitely check out a few docs in your area before deciding on one.