here are some art tips that i find to be pretty objective (cuz i hate more subjective tips/art style tips that pass themselves as fact). these still may not benefit everyone, but i think they are generally helpful:

1. (for digital) flip your canvas OFTEN!!!! don't wait until you are almost finished with a stage. it will point out errors to you quickly. extremely useful.
2. (for traditional) it's not as convenient, but if you'd like to "flip your canvas" you could take a picture with your phone and flip the picture while editing. it's the same concept.
3. (for CSP) while the default brushes in CSP are useful, you should explore and download more. download blenders, pencils, paintbrushes, patterns/materials, anything you can find. it opens a lot more opportunities for you that way.
4. collect images and references beforehand, especially if you're bad at memorizing/visualizing. i recommend keeping a folder/note on your computer or phone for inspirations and references to use later. looking at it can spark inspiration when you're in a slump.
5. keep your drawing tablet or sketchbook flat. it is better for your wrist. doing wrist exercises and building wrist strength is also important so you don't get cramps in the future.
6. taking breaks is not only recommended, but pretty much mandatory. art blocks are normal and so is burn out. taking a break is not only useful for preventing burn out, but is also useful in finding mistakes in your art or figuring out what's been missing. you know that feeling when you're in the shower and a great idea suddenly pops into your head? the same can happen while taking a break from art. you may suddenly figure out that anatomical mistake you've been trying to correct, or think of something to add that'll make your work perfect.
7. if you want to be really serious about art, study from real life. i recommend keeping a note on your phone of whatever interesting observations you make about people, environments, shade and light, etc.. even if you've got a cartoony style, this will help you overall. you may find this more effective than simply studying other people's art.
8. again, if you want to be serious about art, study anatomy. it will not only help you with... anatomy, but it will help you with observation and noticing mistakes in your art. the same can be said for flipping your canvas.
9. while studying from real life is important, you can still take notes on art styles/art direction that you like and dislike. of course you shouldn't make your negative notes public, but recognizing what you DON'T want in your own art is as useful as recognizing what you DO want.
10. (for digital) using the tools provided to you, such as stabilization and transform options, is not cheating. you are using what you have at your disposal, take advantage of it.
11. similarly, tracing is not cheating as long as you don't post it/share it and claim it as your own. tracing can be useful in the initial stages of designing characters, understanding the flow of someone's lineart, etc.. you can also use it to practice anatomy, such as drawing a skeleton type deal over the person's drawing.

in the end, even though i tried to make these tips as objective as possible, you don't have to follow them. everyone's art journey is different. good luck!