If you just need to raise by 4-5 cm and use the bed just for
resting and nothing else, try 4 pieces of bricks laid horizontal at
the 4 bottom corners of the bed. Long time ago, some furniture shop
also sell wooden blocks for that purpose but don’t know if they
still do.
For masonry work, look for home deco contractor specialised in
flooring and tile work. They are capable of erecting wall, building
stove and other concrete stuff. But they are not cheap, a new bed
frame may be a better solution.
