Hey Friend,
Do not be dis-heartened. Keep working hard at your drawings, that's how we all get better. Always be inspired by what you see and the artists around you. Be inspired by them, but do not lose your flavor of the art as I believe every artist brings his or her uniqueness to the medium. I can refer to you some places where i go to be inspired. Am sure, you might know about this.

Quick tips also:

Free your mind and also, free your strokes. A lot of times i have realized, when i think too hard on something, i don't get it. Let your hands move freely and you would be surprised by the results.

Also, think of your characters and environments as 3 dimensional, with a form. It helps you better understand how certain surfaces, objects react when light falls on them.

And also, do not look at your drawings and just look at the faults. Do compare it to your previous drawings and you will be surprised by how much you have improved. Highlight that and keep going forward. This will keep you motivated and not lose your passion for this beautiful art.

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Best regards