Make your game better, newer, exciting.
save your game because its a great game. There is a list of features you could add that would make players very hooked and happy. It would be more likely to attract more new players and old players who quit.
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make cinematic trailers pop up full screen for players to make them feel like they are in a game with story to have passion about heroes they play, to choose side good or bad etc...[sg-syndra]
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make champion picture to pop up and use him as a guide to new players who teaches them all the different aspects of the game (can be different character for each aspect).

3.Make missions more exiting with story, like you are doing something to help out a character in trouble and you would get something as a gift from them for saving them.[sg-soraka]
There are many other things you could think of to make this game feel like a magical place full of fun.
Please add these features, to make the game more exciting because its a great game, I remember how hard it was for me to learn to play it, how hard it was and how much time I have spent to make my best friend like it.[sg-zephyr]
But starting other game like Hearthstone was easy, I got instantly hooked, no one recommended it to me, but it had made me super excited about the game.[slayer-pantheon-thumbs]
Other games like fortnite has the cinematic feature, full screen client and I think it helps a lot for them to attract new players.
I know you have great artists who would handle this task.[slayer-pantheon-popcorn]