I appreciate your kind words. The fact of thinking of helping is already more than enough.
Indeed it's an enormous amount of time that I spend on maintenance, including deleting the spam comments.

If you have any experience with Drupal I would be happy to talk to you to see how you could help.
If not it's not a problem, already the fact that you thought about it made me happy.

For example I've been struggling with html, css, javascript, as I'm not an expert, but eventually after many hours and some sleepless nights :) I always find a solution.
Here is a difficulty that I faced recently for which I asked some help this morning:
https://drupal.stackexchange.com/questions/315032/html5-tags-and-javascr...

The whole website is a one man show for the last 10years+.

I would like to create more content and I have 200 ideas, including speaking exercises. I did a research some years ago, but had to stop as I realized that it was full time job for 1-2 years.

I'm 90% done with a new feature that I'm working on: after replying correctly to the questions you will see a part of a picture. After answering all the questions in the same translation table, you will get to see the whole picture. The pictures are carefully selected to depict one idiom in Romanian, or one Romanian personality... It was quite challenging from a software development perspective, to display just one part of a whole picture, and my kids insisted that I make it in a shape of a puzzle. But I liked learning about svg, css3 animations, clip-path, overlaying pictures.

On some of the pictures I had to spend some hours :) e.g. one Romanian idiom is "minte creață" which means curly mindset. I found a way to depict it in a picture. Another one is "Frectie la picior de lemn" This one is quite challenging to do in a picture. I have some ideas but it involves a lot of Photoshop. I'm proud of the "cățel de usturoi" (garlic clove) that my son helped me doing. You will be seeing all this once I roll out the new feature in production.

Then I still want to allow to replace the pictures with a short clip of a movie. I know it's possible in css and svg.

I hope that in max one month I'll be able to roll it out in production. It's working in the test environment I still need to finalize the 10% left.

I'm also quite advanced with the redesign of the front page, and hopefully the whole page. I find the design quite old, but I had to set some priorities.
And last in some months years I'd like to add a free pronunciation lesson for the persons that finish all the lessons.

I have many ideas, I just need a 48h day and my kids to grow older to allow me some more free time.

The good news is that I'm as passionate as in 2010 when the site first went live.

Sorry about the long post, since I work alone I do not have that many chances of sharing about my own challenges :)

Happy to help!
P.S. In the past I even had a dedicated page to talk about the site features, but I could not maintain that module there were quite some issue so I had to disable it