Being level 70 does have its perks. For one, you can solo the Scholomance instance and farm for the Lifestealing enchant formula. This is one of the rarer enchant formulas because it only drops from the elite Spectral Researchers. It has a drop rate of 5%.
Soloing Scholomance is easy with your level 70 character. You can also try to solo the instance starting at level 65 but it’s harder to do it at that level. When I tried farming for it, I got it off the 3rd Spectral Researcher I killed. Although I heard that some have trouble farming for it. There are reports of players getting it on their tenth run.
The Lifestealing enchantment is in demand because some prefer it over any other enchantment. Rogues seem to be in favor of Lifestealing. This is especially popular for twinks because of its higher proc rate than the Crusader.
You can sell this formula for at least 120 gold easily. But it would be best if you have an enchanter charater so that you can enchant other player’s gears for a fee. This is more value for your farming time.