My favorite word for tackling the clutter and stuff issue is not the word austere, or minimalist or even the underused word Spartan. It's the word manageable. Keeping it manageable (whatever that means to you) means keeping it under your control without going overboard.
I take at least one or two items a week to the thrift store and sell at least three items a week on eBay, and I still have loads of stuff. I try not to let it bother me since I still plan to take things to the thrift store and sell those items on eBay every week. Keeping it manageable means staying on top of everything as a daily, weekly, monthly or yearly job. Sorry to say, it never ends, but once it is part of your life, you hardly even think about it.