There is 100% something after death. But I feel like we as humans can't imagine and understand what this could be.
Imagine if it indeed is nothingness - we can't understand what nothingness is, how it feels etc. It must be something we will be able to understand only after we die. Its similar to what blind people see - nothing. Someone once described it as "what you see when being blind is what you see through your elbow. Exactly, nothing". Although in some cases blind people see black, white, colors, some still see "nothing". We can't comprehend and imagine how it is like to see nothing. This is the same thing when we think about nothing after death.
I compare it with 2D and 3D. if you look at a cube in 2D, it looks like a square. We don't know how it looks in other perspectives and what's behind it. In 3D, we see the entire cube, not only a part of it.
Maybe the afterlife is something similar. Maybe there could be heaven, hell or nothingness. Maybe something completely different that we as humans currently can't see and understand, and it's beyond our capability. Maybe our brains aren't able to identify these things.