What I would've done differently if I was publishing my 1st novel again

Photo by Joel Robison

I got asked this fabulous question on Twitter and scratched my head, because yes, there would be a gazillion (okay, not exactly gazillion, but many) things I would've done differently if I could publish my 1st novel NOW, with all this knowledge I gained from self-publishing over the last 2 years. Almost 2 years. I will be 2 years in May since I quit my job and started writing full time, and since I self-published my very first book, a little book of tweets on writing...