when I am supposed to fix tech debt? if every week there is another functionality going out that needs to be done yesterday? Do you think that I have to do it in my free time? Why should I even bother existing
Try to lie about how long will it take. Just today I finished* 1-month almost total rewrite of firmware for one of devices at my work. It started as a 1-week small rewrite of part of communication module for a small bug and was scheduled as that. But I've got chill PM and coworkers who will appreciate that now we can actually fix some 8yr old bugs in legacy parts of that code.
* well, now some testing of edge cases and another round of fixes but at least remote code updating works so we can ship those devices...
Edit: "Lie" is call to action here, there were some misunderstanding in comments. Previous start of my comment was "Lie. ..."
It's not lying to your boss, it's part of doing quality work.
Of course you shouldn't let perfect be the enemy of the good. You do still need to ship. I'm just suggesting that you don't let your boss know the ways in which you can increase your tech debt by cutting corners.
Of course, it sounds like you have buy-in from management for these quality standards. For people who don't have this kind of buy-in for the whole team, they'll have to work individually to maintain quality.