Your UX is bad? Your UI looks old?
Accessibility sucks? Perf is bad? Design team can’t ship stuff? Customers annoyed by tons of bugs? Everything takes too long to build? No time for small usability improvements?
Hire. HTML. And. CSS. People.
Every problem at every company I’ve ever worked at eventually boils down to “please dear god can we just hire people who know how to write HTML and CSS”