Brutal prioritisation for accessibility is only half the battle.
The other half is keeping the momentum going once you've shipped that first thing.
The simplest rule I've found is to always have one accessibility thing actively in progress. Not things, not a list of things and certainly not a roadmap. Just one thing, the most important thing right now. Ship that one next.
It doesn't even matter if that one thing seems small. What matters is that something is always in motion.
The moment your accessibility queue sits empty, nothing gets picked up and accessibility quietly goes down your priority list. But having one thing in progress at all times keeps accessibility alive. It also keeps you honest, because you can't do everything at once.
And it means that six months from now, you've moved instead of just planning to.