MARVEL Future Fight 9+

Hello Netmarble,
I have been playing Marvel Future Fight for the past 2 years. I have a request and a suggestion for you. Many new players download this game, and they want to play it, build their favorite characters, and upgrade them to Tier-4. However, it takes them years to do so, which makes them frustrated as they cannot progress in the game and eventually quit.
I know you provide all the materials needed to upgrade to Tier-4, but the most important item is the Tier-4 Book (Book of Vishanti), which is essential for upgrading any character to Tier-4.
This item is only available through GBR (Giant Boss Raid) - Dormammu, which can only be cleared by Tier-4 characters.
So, if a player doesn't already have a Tier-4 character, how can they collect the Book of Vishanti? I tried to experience this as a new player. I attempted to join other players' lobbies multiple times, but they kept kicking me out. This hurts the emotions of players and makes the experience frustrating, ultimately leading them to quit the game.
Not everyone has friends to help them clear these raids. So, I request you to kindly consider this issue and introduce something like a Tier-4 Selector or a Mega Tier-4 Advancement Ticket. Even if it is sold for $10 or more, please add it to the game. Because Tier-4 Books are currently only available in GBR (Dormammu).
Please do something 🙏🏻
And please reply me

Omg this is like the best game ever. So addictive. I’ve literally been playing this all day everyday and also spent a lot on micro transactions. And I don’t regret in doing so because it is definitely worth it. But i would like to suggest something for the next update. I know this is a lot for just one guy to ask but could you add another costume for ‘Hela’ without the helmet (like the one in the scene in Thor Ragnarok when she destroys mjolnir). She looks so gorgeous there and I would be more than happy to use that costume in the game. And also, idk if you can but, please fix some of the faces of the characters. They look alright in their thumbnail but upclose not so much. For eg. Steve Rogers, he looks nothing like chris evans. There are also some other characters but by far cap is the most noticeable. Anyways that’s all i want if you can see to it. It would be highly appreciated. I love this game and will not quit anytime soon. So please see to my request because it’ll make my playing experience even more better. Thank You for making such an amazing game. Excited for the next update!!!

I have played this game for 2 years. 1 year later I got a new device to play on so I decided to play the game on that device I saved my data through google drive and transferred the data to my other device through that. Then soon I deleted this game because I was bored. Recently I thought to download it again. When I opened it my data was not saved. I had actually purchased some items in that game too. I tried to play that game on my previous device but the data was not saved on that too. Please tell me how I can get my game data back.