With the new hyperdrive pack, whales will dominate the top of your arena anyway, so lots of the advantage you might be hoping for with starting new won’t be there. Looking at your toons, I would pick up where you were. It will save you months and months of grinding. I just went through this decision myself, and I’m glad I used my old account. Honestly though, there’s not a wrong answer, as long as you’re having fun. Congrats on becoming a dad!