Each person uses multiple stimulations to get hardon for sex or in masturbation. Eyes(watching porn or seeing nuidity of female in real sex), touch or pressure on genitals(pressing against bed/play with fingers of own or of a girl), Ears( by hearing sex talk on tele calls or talking sex on bed with sex partner), smell of female, kissing etc.will help in sexual arousal. Over and above things, man uses imaginations and fantasies to get aroused in masturbation. Now you have removed pressure against bed and visual by not seeing porn etc. For some time you have to use other modalities like fingers and mind imagination to get excited.  Arousal will again happen. Be patient and keep trying. I hope you got it.