Build Minecraft Forest?

I would very much like to build a forest in Minecraft with self-made trees. How can I best do this? I know you can place something copied with WorldEdit with the brush command, but it only works with a maximum radius of 6 blocks, but this is not enough.

There are other plugins, not just Worldedit.

Have you tried Voxelsniper and MCEdit yet?

So with MCEdit it won't work because I'm on the 1.14.2 game. What is the command for this at Voxelsniper?

I don't know, I have to watch tutorials on it.