Steal and Fence, you can make up the respec costs that way.

Items you can sell for profit:

Emetic Russula 250g
Columbine 340g
Lady's Smock 200g
Ore 50g
Raw hide/leather or raw cloth 26g
Fortified Nirncrux 4,000g-6,000g
Potent Nirncrux 18,000g-23,000g

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Traits for research 350g-500g some people sell them for a higher price, but they also sell at a slower rate.
Nirnhoned trait 1,500g-3,000g some sell them for 5,000g but it gets sold at a slower rate. (if the costumer provides the stone, if they don't then add up the price of the stone to it.)

Set armor and weapons prices depend on number of traits, motif rarety and cost of style stone. You can make it a bit cheaper if the costumer provides the materials.
Some crafters also add more to the cost, if the crafting location is in the Imperial City, because it might take a damn long time to get there, with a pvp threat hanging over your head.

Most money making is a real grind. It's surprising how much you can get for rare motifs- the daily delve in wrothgar has a good chance of dropping trinimac motif pages - worth 20-60k each.

Farming nirncrux, or fishing and filleting for perfect row are dependant on Rng-esus' love for for you.

My current favourite is to do a lot of thieving, in a busy area go around and pick pocket everyone 3 times and immediately destroy any white items so you only sell more valuable stuff.

If you have enough provisioning ingredients then making vet 15 green food/drink is surprisingly lucrative (5 gold each individually, but you are making 4 each crafting attempt), I made 20,000 I'm 30 minutes just because I needed to clear out some excess mats. Selling woodworking to npc merchants is surprisingly well renumerated as well, and really how many stacks of wood will you ever need?

I am always pleasantly surprised at how much I make just from pve questing, and it is much more fun than grinding.

Do writs - one character doing all 6 writs each day brings in 3000-4500 gold (level dependent) for 15 minutes work. My first character is now my crafter/provisioner and only does writs apart from that. He brings me about 30,000 gold a week by the time he does the writs every day and sells what he and my other characters cannot use out of the bags.

Back before I had multiple vet characters I used to do what Jim_Pipp said - make high level provisioning food and drinks and easily make several thousand gold for very little effort.

Otherwise you would be surprised how much you can make just PVE questing. While doing this, loot everything you see and sell it rather than breaking it down.

@medusasfolly I buy my materials, because I can't be bothered to try to farm 20k raw materials that I need to refine within 1 hour. It's just quicker, unless the prices are too high and it pays off to buy the legendary upgrade materials instead of the raw materials for refinement.