I have good luck with Lasagna gardening. Layer 10 or sheets of newspaper and then lots of compost like stuff on top of that (8 inches). There is lots of info on the internet about it. It is hard to salvage good plants when you do this.
Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.