I have been using Godot for a year now and even though it is open source,
the engine is still being ignored everywhere except for the community. Updates are slowing and it might stall if we don't try to fix this.
Unreal Engine, Unity and Lumberyard are being released as free and with their huge community and advanced set of tools, it will be very hard to beat.
There are other open source engines that are also not receiving much attention such as Torque2D/3D, Blender Game Engine
A presence in social media is certainly lacking. It is important that a dedicated Facebook, Twitter page is present. Video demos that show the features and capabilities are also lacking. Quality video tutorials are also lacking.
I think while the strength of Godot is in 2D.
Advanced 3D features is important for Godot to get noticed because game devs these days go for the flashiest features. Advanced features such as raytracing, particle collision, liquid physics and others.
EDIT : I have decided not to mark the best answer to accept everyone's opinion
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