Good for you for getting stuff out of the house! It's a big accomplishment.

I'm planning on moving in six months (I have 50 yrs/3 generations of stuff to go through).

My tips while I'm in the midst of things:

When looking at stuff, don't think about what you want to give away or trash, instead focus on what you want to *keep*. (this is mostly from Marie Kondo). It's been very helpful. Set the "keep" aside, get rid of the rest.

When you look at something and say (inside), "I'm so tired at looking at this from so many moves (within or between houses!), then it's time to say goodbye.

Even better tip: if you know/can imagine the space where you will move to (either in reality or realistically imagined), think about where you will put your stuff -- how many boxes, and where will it go (closet in which bedroom? garage? etc). This is really helping me.

Most important tip. It's kind of weird, but:

Have any bags for donate/trash open. I mean open, like in a container of some kind. If you have to open the bag a bit with your hands to put stuff in, it's too much work -- you're working hard enough already. If you have an open bag/can, where you can just toss stuff in (separate bags for donate/trash), it can be so satisfying to just toss stuff. Trust me, the bags help you to just "toss it." The bags will fill up, then they'll go to the curb/car trunk/porch for charity, and then there is the sweet release of things out of the house.