What should I do with my domain name of 11 years?
imp: Keep it.  It's cheap and if you feel at all emotionally attached then it means you may have some value for it eventually.  If you're asking for outside advice then that's too much thought that you've already put into this.  I've let several domains expire, and it was always an easy decision ("what was I thinking when I got that one?").  Just renew it.