Develop own software or support indepndent sw development however you can.

If you really need something, think about your personal dependencies and try to build some resilience / backups , one way or another.
Whatever your craft, a pathway towards ownership and control of tools and maintenance should be a traditional part of mastering the craft.
So that you can eventually do things like extend the toolset, or adapt tools to niche circumstances and advance things along.

If you don't have that pathway, then you might end up trapped as an apprentice or journeyperson and will continue to be exploited by those who control the things you depend on.
If there's no freedom and no way to develop competition in the supply chain, then you probably would benefit from - collective organisations such as trades-guilds, or professional associations or trade-unions to counter the power imbalance, and represent your needs - but they can also get captured/bribed so those probably need a bit of effective democracy / transparency/accountability or something. I'm not going to suggest govt regulation, becasuse that's super easy to capture and national-election democracy is a weak control, but you might get some progressive govts like some European ones that'd think about doing something suppoting foss projects, maybe.

It might not be easy, but you have to look for and support those types of features for the good of your industry.
Corps will eat their industry for a quick $, it's the workers, tradespeople and masters of the craft and some small businesses who care about the long term. And maybe any enlightened customers if you're lucky enough to have them.

As an example, for physical 3d cad, personally I don't like freecad much it's complex and not very intuitive; but it lets me do all the maths I want in python, with my own made up data structures / object model. So i'll use and support freecad 100% over all the other more user friendly CAD that i've seen - it really is the freedom, and not being so dependant.