I do not like the fold and roll method Marie Kondo uses, when I put the t-shirts on it looks like I slept in them. I do agree with the nostalgia part, just go through the box, do not look back, do not read every card and letter. Toss out things you don't love. Do not save things you think your family may like or want after you're gone. Ask them now if they want photo's, letters, cards., etc. The best thing is if you haven't worn it, used it, looked at it then toss it. You haven't used it, probably didn't remember you had it so get rid of it. I hate clutter, it just looks untidy to me.