As Iron Age civilization developed, there was a point where magic and spellcasting overtook every other development. While non-magical sciences and technology are starting to slowly catch up, there are still a large number of magecraft jobs that Iron Age humans take for granted.
One example is that of a Farm Mage. They cast specialized death magic that can distinguish between plants, pests, and beneficial creatures. A group of them will travel between farmlands casting water spells during droughts, creating and pulling water from the sky. Due to their efforts, average crop yields are much greater than they would be without the use of magic, and without farm mages, Vreathe's population just couldn't be what it is now.
Another is that of the Apothecary. Iron Age medicine would not function as well as it does without a skilled mage charging various concoctions with mana. Antiseptics wouldn't work as well without being charged with death magic. Potions that accelerate or instantly heal wounds wouldn't work at all. Plagues and disease would overrun society.
Even Smiths use some of the workings of mana in their craft, using some amount of fire and earth magic to work molten iron and steel to remove impurities. Actually shaping tools and weapons with mana is beyond the skill of most human smiths.
Most cities are kept safely lit at night by the use of glow stones, they aren't charged on their own and need a skilled mage to do so. Then there are specialized healers who perform the craft entirely by manipulating mana, mending broken bones and the worst of diseases.
i know you said that making this was more harder then you thought, but I believe you did very very well on it!! :D Magic is sometimes the hardest things to write about in a fantasy setting, but you did an amazing job! Keep up the great work!!
Thanks for reading and leaving these kind words!