Add achievemnts to the game that will be achievable for example in the future so that over time they are achievable by all characters in multiplayer but also in singleplayer and give rewards for them in the form of items, skins, golds or titles under the player’s name - these achievements should only be achievable solo so as not to create titles that will be sold because they will be grouped (to make the game fair play), higher tier titles could include colouring in the text or marking the text in a different font under the name or for example colouring in the player’s name so that people playing multiplayer can see that you have achieved something spectacular yourself