The number on your scale is less relevant than the reflection in the mirror, you know? So I think what you really mean to say is that you don't want to lose size but you want definition. Unfortunately, most cutting diets and cutting supplements result in some loss in size. You can minimize the size loss by properly training and eating the correct macros. How much weight were you losing when you tried to cut up? What is your current bf %? Regardless, most find the best success by alternating cutting and bulking. 200lbs. at 5'10" is pretty nice bro. Try focusing on cutting for 10-16 weeks, without worrying about the scale and expect to lose a little size / strength. Then bulk for 10-16 weeks and expect a little fat gain.
I'm going to dinner with the wife now but I'll get back on later and post tips on how to minimize muscle loss while decrease bf%.