Yes, i have purged five characters i created because either the RP ran its coarse or the people/reason i liked to play them had gone inactive.
I’ve never regretted it. I think part of the reason is because I’m not an alt-oholic. They were created, leveled, and developed for a purpose. I think most alts people create first and then find a place to put those alts in. I think you grow too attached if you created it before needing it.
I say do it! And, write something up for it to go down for a cause. Like a death in battle or attempting to reach beyond your limits. Perhaps have your new character be a result or some how affected by the previous one. That way it’s a fresh start, but also not a total loss of self.