I know, I know, it's some new twenty first century phenonium. Our great grandparents crossed continents with two sea trunks, and we have so much stuff... everywhere! So if you have too much, and feel overwhelmed, number one, you are not alone in this!
And I know all the good questions - does it spark joy? will you use it in the next 3 years? Is it easily replaceable?
And I know and offer all the good suggestions - do a drawer a week, nothing more than that but do it every week. Write lists and follow through, start with a space that really matters to you (around the computer, makeup shelf, coat closet - something that bugs you now.) Give your stuff to charity, it's not trashing it, it's giving it to someone in need. Photograph it, collate it, organize it..
And still, sometimes you are just drowning in stuff.
I am lucky. I've changed countries 4 times so I'm quite streamlined. My one strong suggestion is put nothing into storage, if it can live 10 miles from you, you don't need it.
Whatever you do, just don't keep drowning in it. One step at a time, and a year later, the place is cleaned. Whenever I put my summer wardrobe in plastic boxes and bring my winter wardrobe out, I go through my clothes, the old, the tired, the tatty, I let them go.
So find a habit that works for you, and just start. I know, this isn't the instant solution people want (though I do know people who have hired declutterers to help them go through a room and be ruthless on their behalf. So if you are drowning, you can get someone to help you.) But if you are doing it on your own, it's a marathon, not a sprint, give yourself time and breaks to get it done.