Most of us don't want to spend all day decluttering. So decluttering fast will enable us to get quicker results in less time.

Get Rid Of Large Items First

Large items are annoying for obvious reasons. They take up lots of space. By getting rid of those first, you free up lots of room. Which makes a big difference and will encourage you to keep going overall.
When we only do smaller items, it's easier to give up because you no longer feel like you are making progress.

You May Have To Lose Money!

This is a sad truth I started to realize when I started decluttering. I had to lose money on some items. Items that were foolish to buy, Or things I didn't use. Had to be quickly given away. Or sold for less than I bought them for.
It can be tempting to hold on to things just because you spent a lot of money on them. But if they aren't bringing you any value, Why keep them? At that point. You aren't only losing money, But time and inconvenience of that item existed in your life.
Just learn from your mistakes on what you bought, And avoid buying those items again.

Simplify

When you start to see how much simpler and easy your life is, It can encourage you to do more.
The more I get rid of, The quicker I'm able to get things done every day because everything has its own designated spot.
Things aren't in my way as often.

Figure Out How Much You Need

We always end up thinking we need so much more than we do. Do we need the largest bag of food? A lifetime supply of makeup wipes? Think realistically about how much you buy at once. Sometimes you can save a ton of money by buying in bulk. But sometimes you also waste money if you end up not liking that product anymore. Then you are stuck with it.
I found this to be true when I bought a gallon jug of shampoo for myself. I liked the shampoo and had used it for a long time throughout my life. But once I had that gallon I stopped liking that shampoo and realized it made my hair dry. I then had to switch, and some of that shampoo was wasted as a result.
We can avoid doing that, By being careful about how much we buy at once.