I think many of us have been here! I picked up art again a few years ago after not touching it since I was a kid and while I was doing lots of 'fundamental' practice, I didn't know what to really apply it to, even though I enjoyed doing it. I would constantly sit there thinking 'how can all these artists have so many ideas and creations, I can't think of anything! What do I want to draw? What type of art do I want to do? Etc' Well, now I've finally got some (not completely flowing freely yet!) inspirations and ideas through slowly realising what it is I actually enjoy, rather than looking at amazing art and wishing I could replicate that: I love insects (particularly wasps), used to love collecting them as a kid but I'd forgotten about it until I moved house to one with space and nature around and reignited the curiosity and inspiration! I now enjoy macro photography and hopefully translating that into art. Not saying it's easy, or that it'll come immediately, but take some time to think about what you really enjoy... or perhaps used to really enjoy before you 'grew up?' What things (not art) do you see that excite you? Draw that! And if you're not feeling inspired, do the fundamental: lines, boxes, spheres, they can always be improved and keep you practicing and building the habit. Hope that ramble helps! Here's some insect drawing fun I've been enjoying for inspiration. The best thing is, if it's something you enjoy drawing, you don't mind so much if it's not great because you're learning, not trying necessarily to copy something amazing already.

I'm not sure about the purpose either. It's been more technique driven for me for the past few years, but in recent one or two years I'm trying to find my own voice through things and visual elements that I'm interested in and those I want to see becoming an reality. It's hard to put down in words, but I think mine for now would be something like I try to create a alternative history line where I can see a lot of things I like happening.

I think that looking at artists that you love can help you out in finding out what your purpose for your art is. Whenever you have trouble with knowing what to draw, it can help to try out a class that you are interested in learning and see how you feel about the subject.