On top of what people have said, I have a few suggestions. One is to reproduce recent papers for which the data is available and especially if the source code

On top of what people have said, I have a few suggestions. One is to reproduce recent papers for which the data is available and especially if the source code is available. Don’t look at their source code initially but use it if you get stuck as a debugging method (my model isn’t converging, do they get the same gradients given the same data?) Another is a fun idea to play with: sports data sets. Of course you have to like at least one sport but there’s lots of sports data out there that is easy to download in convenient formats (especially for baseball, where professional statisticians have been employed to do analysis since at least the 50s, but afaik all the major sports have good records these days) and you can go a long way with simple models. I’ve wasted a lot of time on the weekend coming up with fun baseball analyses.