Unless you're a massive creative house, the best option I see is to wean people off piecemeal. Part of it involves education because a lot of people don't even realize that alternatives exist. Part of it also identifies "low hanging fruit", ie: people who simply don't need any unique features exclusive to Adobe.
For us, for example, we have several users who need to do some basic PDF manipulation. I could be spending $100/month just on acrobat licenses alone, but instead I pointed them to PDFElement by Wondershare (https://pdf.wondershare.com/). It does everything they need and for a fraction of the price.
For Illustrator and Photoshop, there's a rising star called Serif who put out Affinity Designer and Affinity Photo. They're not quite as full featured as the Adobe equivalents, but they are priced downright cheap compared to Adobe. Importantly, there are both Mac and Windows versions, allowing for interoperability between platforms.
People have also mentioned Paint Shop Pro, which is also a perfectly good piece of software. It's Windows only, unfortunately, but if you're a Windows-exclusive shop, then this is another option. IIRC it even supports photoshop plugins.