I’m guessing this projectile is launched from something right? Like a cannon or enemy or some point on the map. It would be better to move it inside of an actor and then you can have many of these projectile emitters on the map with their own logic / ammo etc.
Keeping this in the level blueprint is bad practice.
You can directly reference actors in the level bp (just drag them in from the outliner to the level bp) but they need to already be in the map, which doesn’t happen in the case of the player pawn (it spawns in during begin play)
You would need to rely on the “get actor from class” function to get the player into the level bp, but like I mentioned it’s bad practice and your level logic will become hard to handle pretty quickly.