A couple of popular options you might want to explore are Shotcut and DaVinci Resolve (the free version). They both offer a decent range of features without breaking the bank. Plus, they can handle more modern tasks compared to the older Windows Movie Maker.
It's great that you're already using OBS Studio, Handbrake, and Audacity for different aspects of your video creation. Those tools are pretty solid too.
Oh, and speaking of free video editing, I came across this link that you might find helpful https://www.movavi.com/learning-portal/free-video-cutter.html. It could come in handy if you ever need to trim down your videos.