Kelly and hello from your southern neighbor ( about 130 miles away! )
Without asking a plethora of questions I think it would be safe to assume the seeds you bought are indeed compatible with your area, and being WILD flowers they won't really need much from you other than what you already stated. If your mulch was removed like I would do it, it's still on the weed barrier or piled next to its previous home, if so, then using a garden rake, I would remove the bigger less decayed pieces from it and evenly cover the plant area with it and plant my seeds on that, ( my opinion anyway ).
It should go without saying that since this used to be overgrown with weeds then there is a very good chance that most of the seeds you covered 6 years ago are still there and ready to sprout. If you're used to their presence, then you should be able to easily identify them and remove 'em,.....But, keep in mind that a lot of wildflowers look like weeds as well. I've planted, in 3 consecutive years, wild flowers in my back yard and still end up pulling what I thought were flowers every summer! Also check your package to see what kind of flowers are in there, I don't mind Marigolds as much as I used to but I vehemently detest Chinese forget me nots, if they are present then you would be better off cultivating sandbur.
Hope this helps,