Hello everyone!

I just started a new game on my PS4. I previously played and wanted to cut my played time in half by starting over. Now that I know what to do I figure it won't take me long to do everything. The thing is it doesn't reset. I go to new game but the file always says the same time, over 100 hours. So what am I to do? Is there a way to start from scratch, or am I stuck with the 100 hours?