Legion Remix myth raid difficulty.

So I've been out of the game for 5 years, came back just in time for Legion Remix. I joined a normal Emerald Nightmare pug last night, not even max level yet. I was shocked at how easy and fast it went. I know there's a reward for clearing every raid on mythic and after last night I have to wonder how viable this is for me. I consider myself a step above average casual before I quit. Better than most but didn't think I was good enough for the highest tier of raiding most of the time (cleared probably half of Heroic Firelands). So do you think I have a shot at clearing mythic raids?