You say you're selling one pen a week for seven years. Most of the sellers on the forum would dream to have so good results!
But if you want to do more, as it has been said, underpricing is no good. For other sellers who try to live from turning neither, by the way.
Another point : maybe you should consider giving more attention to your description and keywords. They have to be obvious and used by prospective costumers: people are asking what they want to the Etsy search engine through very few words which you have to use in your description. I checked your keywords for one pen, and I read : accessoire, student, gift, office, graduation, monet style twist, segmented gold, yellowheart wenge. I doubt anybody who wants a handmade wooden pen will ask these words to a search engine. And I don't see "wooden pen" or "handmade pen" amongst your keywords. Working on search engine optimization is one key I suppose.
Hope it helps.
