Hello friend greetings to you, hope you are doing well and good there.

You have explained very beautifully all the layers of Blockchain. A perfect example make it very easy for the readers to understand your point of view. This is very much true that Horizontal Sharding increase the efficiency of the Blockchain.

Sidechains and Rollups are two important things associated with Blockchain. They both increase the transaction speed and decrease burden on main Blockchain. It also decrease the transactions fee.

I wish you very best of luck in this contest.