Edit: note this may not a good idea to do for many psychological conditions, and check if it will hinder any treatment you are partaking in.
*chuckles* good one!
I have or use to have restartitis myself. Here's what I did to alleviate it. I have 3 main characters. A mage, thief and ranger/marksman type. Depending on my mood, I play one of the three. All 3 of them are different races. My Dark Elf is the mage. She's the bad girl. Thief is my Ohmes-Raht, she does what she does when she wants to do it. Ranger/Marksman is my nature loving, do the right thing when I can type of girl. It satisfies me immensely as I can play how I want, when I feel like it. I get the best of all worlds doing this.
As far as what class/race/skills, etc. It's pretty subjective to what you want. I always went with what made sense for my particular character. If there was something after I started I felt she needed such as ... Acrobatics. I incorporated that into my RP and she would practice such things in the evening before she went to bed. Or when she would have spare gold, spend some time with a trainer. Doing that help expand the RP and let me work on things I wasn't satisfied with naturally.
Hope this helps you some!