The best way to for anyone to start is to spend a few minutes with the Learn Workspace and get a handle on the UI. The next thing you should do is take a quick look at the User Guide. It sounds like you are past that stage.
Be very warry about tutorials you find on YouTube. Most of the new ones that float around there are prepared by enthusiasts and a lot of them show pretty inefficient workflows.
The Linkedin Learning series is pretty good. There are some great books on visual effects and compositing that don't necessarily concentrate on After Effects. The Illusion of Life: Disney Animation by Frank Thomas and Ollie Johnson should be in every visual effects artists library and you should read it about once a year. The Filmmaker's Guide to Visual Effects is another good book. There are lots of them. Books on specific software like Adobe After Effects CC Visual Effects and Compositing Studio Techniques are pretty good at giving you a good how to use the UI but they tend to get outdated pretty quickly. Personally, a good book is a lot more valuable in the long run than a few tutorials.
You should also study color, lighting, spend some time analyzing paintings by the masters to get an understanding of how light works. Take your phone out on walks and look for things that show you how light behaves when it wraps around things. Landing a VFX job is about 90% your sample reel. Don't make it too long. If it doesn't wow you in the first 15 seconds, do some more work. Start by picking a specialty. Generalists are a dime a dozen, so pick something you really want to do and work on creating something original. You don't need fancy cameras and a fist full of actors. You just need a couple of very well executed ideas that show folks that you can create magic.
The most important skill anyone in this business can master is estimating the time it takes to get something done and meeting your deadlines. If you always deliver quality work on time and under budget, you'll always have work.
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