Merge objects in softbody simulation I have joined the objects but they just won't hold together. In the first image, it's as it should be and on the second once it hits the ground, the objects get separated.
You have joined cubes into one object, but in Edit mode vertices are not merged.
Hower with a cursor above a vertex and hit L (Select Linked) ...

your mesh is selected partly - means vertices are not connected. This is the reason why it falls as separated.



it should behave like this ... I used Remesh modifier &gt; Blocks to quickly generate merged cubes at similar density like yours ...



BTW - Your topology is too uneven and dense.
Wire density has essential impact on simulation result.

With the same Softbody setup, but low poly resolution ...

Here after Limited Disolve X operator ...


Note: You have to Apply Remesh modifier before simulation, because Softbody sim is calculated first and Remesh after - so it wouldn't be taken into a count in simulation.