Website Currently under DoS Attack

So uh my forum has been down for like 16 hours now, and I was just wondering if anyone knew of any good security measures I could use to get it back.
think it's a layer 7 ddos attack, and that goes by cloudflare. Pretty sure it is just a couple kids having laughs from a competitor forum or something. Well, my forum is like brand new so it's kinda dumb but yeh. I mean I got cloudflare free but that obviously is not going to so a thing

Sorry kinda don't know anything about stopping ddos attacks