MonoGame is still a thing! and many games you've heard of were made with it https://en.wikipedia.org/wiki/MonoGame#Games

I first started learning C# and XNA before college to make a game for my Zune HD. That was my first exposure to OOP. Ah, those were the days...

I do too some days. I keep meaning to do a deep dive into MonoGame to see where it is today and where it may be going.