What is the ruling on practicing masturbation when lust intensifies and erection recurs, with the intention of releasing lust, not with the intention of lust itself, and is this act forbidden, knowing that a fluid is discharged daily after urination?

What you are doing falls under prohibited masturbation, so desist from it, and treat your condition by fasting. Hasten to marry so that you may be among those whom Allah Almighty described, saying: (And those who guard their private parts Except from their wives or those their right hands possess, for indeed, they are not to be blamed. But whoever seeks beyond that, then those are the transgressors). And the fluid that comes out after urination is likely to be wady (a thick white fluid) if it exits without arousal.