Adding monetization features to my Unity game

I have a classical block puzzle game in Untiy and want to add some monetization features in the game. I want to offer rewarding videos to users to get benefits as below: - Changing option of 3 blocks that are not used (blocks that are staying out of game arena) as a set of 3 blocks. - Changing option a specific block that is not carried to game arena. In this option, changed block must be usable in the game arena. It should fit well. - Showing next incoming set of blocks as ghost below. By that, user will have a chance to see what is coming. - After game over, before interstitial ad, we ask to continue game to user. If accepted, he/she watch a rewarding video. After that, he/she returns game. We delete past six movements. - After the game over, user can decide double his/her score by watching a rewarding video. In order to increase competition, I want to add simple Leaderboard by using Google services. Add Admob mediation unity package. Feel free to ask!