If you know what you don't know, the solution is easy. Go learn it and level up!
HTML and CSS? There are plenty of courses online. MDN is awesome! React, Angular, Svelte, Vue? You have Frontend Masters.
As a developer, you know you need to learn these things and there is already a path for you. You're not the first to walk it, so you can just follow in someone else's footsteps and learn from their journey.
But you don't now what you don't know. This is where it's scary! Uncertainty is scary!
But this is also where growth happens. In the unknown and the unplanned.
I've coached students who said they don't know accessibility. They don't know what it is and why they have to learn it. They can't understand what a screen reader is because they never use one. I did some digging and I understood it's not that they don't want to learn these things. But because it all sounds so complicated and abstract, the outcome is uncertain. They're not sure if it will actually help them, if it really matters and, more importantly, if they can actually learn the concepts easily enough and fast enough to matter.
Going from not knowing to knowing is a big gap. It's a big leap when you look at it from afar. So there's uncertainty they'll land safely on the other side once they jump. Add to that the time component. Because they can't make that big a jump in a day. It will take time and the payoff is uncertain when you look at it.
It would have been easy for me to spill out a bunch of definitions and declarations that it's a basic right for everyone, how it's important to do it, how it can help others.
But that doesn't clear up the confusion one bit. What worked for me, and how I got hooked, was by being curious. I was curious because I didn't know what to expect. I didn't know why things were they way they were and how I could make sure what I did was better.
By being curious, I completely forgot about the clock and the gap. It felt really slow in the beginning. I was basically standing still, there was so much to learn. And I got things wrong a lot. My students did too.
That's ok. It's expected. The future is uncertain, but your personal growth is inevitable once you make the leap and face the challenges.