add very simple metal handrail to the wall on the right that is continuing around the corner to the next flight of stair make sure the way the handrail returns around the corner goes down the next flight use only two supporting brackets on the long piece of wall only as reference use this product https discount diy co uk indoor handrail kit 36m srsltid afmboornpmrjuc4waexbeuxcamcib3sgii8j sfveal0gznju8zjoco1