As the title suggests, I'm seeking advice for mapping and currently I've finding some difficulty with my maps because I'm either running out of ideas or getting burnt out quickly. I'd like to ask if there's any advice to making maps, rules to follow (even though it's mostly free form) and ways to keep it interesting. I sometimes use screenshots from maps I've played or maps on the internet as ideas and inspiration.
A lot of my time is spent looking for the right textures and rarely know where to go afterwards because so much time is pent thinking about what looks nice rather than structuring the map well for gameplay, and that's most of the trouble I'm having. Is it often good to keep the textures and structures relatively simple if you're still kind of new to mapping? I have about 3 or so maps under my belt currently that I've managed to experiment in and learn different techniques but I still have a hard time trying to make the structure interesting.
Many thanks in advance, and I look forward to reading anyone's advice. Doom mapping is something I'm really passionate about and I'm still learning.