1. Support your mattress with a bed base
Since a bed base is the support of your mattress, changing the bed base could have effects on changing the overall support of your mattress.
The most common bed bases are:
Box springs – A box spring, which is often hollow and made of wood or metal, are designed to lift and support an innerspring mattress, allowing for added bounce and comfort. It is not suitable for a foam mattress, so if you put a foam mattress on a box spring, it might feel a bit firmer than it should be.
Box spring is a box with springs inside that function as motion isolators for bouncy and disruptive coiled beds.
The Foundation - Foundation itself can be either a solid or slatted platform, which tends to make a surface firmer, so if you put a foam bed on the foundation and feel uncomfortable, consider switching to an adjustable base or a slatted base.
Bed slats – Bed slats can be made of wood or metal planks, and they came in two forms, standard and sprung. The former is flat and sturdy while the latter is curved and flexible.
For a softer mattress feel, choose the sprung ones that are spaced no more than three inches apart.