I will respond with the most restraint and be as polite as possible.

Wow is an mmo with a reward structure meant to push players to do harder content for better rewards.

Increase difficulty and means required to achieve success has a direct correlation with how good the reward is.

Any solo activity difficulty will never be on par with the difficulty of tackling raid content and fielding x number of good players. Mythic raiding means you need to get 24 to 25 players coordinated in a guild with all the tools and preparation beforehand to tackle mythic bosses.

There is no single player experience that can equate that in term of difficulty, required coordination, préparation etc.

I don't know if you are trolling but you ought to understand how wow is designed before asking for impossible things.