Yes, selfplay is the safest way to boost, because you don't give your account to anyone, you just play in a team with experienced players. I myself was skeptical before, but eventually I tried several services and I can say that the main thing is to choose a proven platform. For example, one of the reliable options is
link. They just have a selfplay option, where you just log into the game and go into the dungeon with a professional group. This completely eliminates the risks associated with account transfer, and you get a guaranteed result - a locked key and loot from the Great Vault. I used this service a couple of times when I didn't have time to look for a party, and everything went smoothly. The main advantage is a well-coordinated team, which clearly knows the tactics and mechanics, so even difficult keys go quickly and without unnecessary stress. So if you want to get a quality boost without risks, selfplay is what you need.
