Decomodify software. Refuse to respect copyright laws for software, or mandate that all software must be GPL or an equivalent restrictive license.

Make it so that all government software must be GPL, that would remove an enormous install base from corporate entities. Certain EU countries are already doing this.

If you are a public institution of any kind, you should not be using corporate, proprietary software, no exceptions.

Closed source software and hardware is largely what allowed massive corpos to take over the software and hardware scene, and it's what creates the incentive for silicon valley tech bros to create new technology solely in the hopes of being acquired for hundreds of millions, or even billions of dollars by some massive megacorp.

Corpos and private equity scumbags wouldn't be interested in acquiring these companies if they knew all the code and technology was under a GPL-like license, and anybody could take that tech, modify it, redistribute it, fork it, rebrand it, etc.