I have come and gone over the years in SL and know how you feel. The last time I stopped I cancelled my account and wiped out everything on purpose. I already knew from the past I would return after a break (I always do). So, this time when I returned I started fresh not a newbie in experience just looks it gave me some of the old feel of rediscovering SL.
Not sure if that helps, but when I returned this time even without my inventory and old AV it was a bit more like the first time. The need to rebuild my SL life over again from the ground up also gave me insight into new things in SL and new ways to build and explore. So unless you have a big inventory you want to keep, or a reason to hang on to the old you dump it and start over when your ready.
The only thing that concerns me now about SL is the direction it is going, hopefully it will not change from being a social experience with game options to a sorry to say place where the more shady side of life lives and grows. The search option use to be a place to find in world events and land for sale. Now it looks like something out of a porn magazine with all the ads. for phone sex and stuff. LL created an adult area for that and it seems to have spilled out into most of all SL these days unchecked.
But whatever you do best of luck to you.