Make a list of why you are downsizing to begin with. It's not because you want a simpler, clutter-free life. If it were, you'd be getting rid of more stuff easily.
Do you have a year to do this?
A few years ago, I started that closet-hanger maneuver. On Jan. 1, turn all the hangers backwards in the closet. The first time you wear something, turn the hanger the "right way." After 1 year, you know what you didn't wear.Get rid of it. Do the same thing in your drawers - turn folded items upside down, and only right them when you've worn them and enjoyed them.
Put a sticker (garage sale type - removable) on the bottom of your plates, serving pieces, candlesticks, pots/pans, cutting boards, you name it. If you have multiples (colanders, measuring cups, platters, cheese boards), then use the numbered stickers so that you are forced to use the $1 ones first, the $2 second, etc. Stick to that. When you use them, peel and discard the sticker. After a year, you know what you don't need. If you move and find you desperately need another colander, you can buy one then.
There are organizations desperate to have your things that sit unused. I've been working with resettled Puerto Rico hurricane evacuees, and they've come here with a suitcase or two of clothes and not one single plate or coffee mug or teakettle. They've lost everything, or they've been forced to leave it behind. They've taught me a lot about what's necessary. Meantime, you'll save the cost of moving these things and you can start fresh.
Figure out why you're holding on to certain things. Is it because your mother held things from her mother, and you feel you must honor her by doing the same? Is that important? Do you have family members who would really want some of those things? Or would putting them in an antique shop or a consignment shop lighten your load? My mother-in-law gave us a silver tea service she hadn't used since the 1940s. We held it (unused) while she was alive, and then parted with it in the 1990s. I never missed it.
I have a few things my son and nieces want, and a few things I'll keep forever because I use them, but otherwise, they're just things. They may be things with memories attached, but they are memories.
If you have the time, I'd suggest you take a year to read on the topic, watch relevant TV shows, label things, and make a list of your reasons for moving and what you are hoping to gain in your new place and what you are willing to shed.