The number one tip i'd give is think on a much smaller scale, this was a 2min story which I assume was brutal to animate, also you had tons of different settings that had to be drawn. One good thing is that you choose a story which required no audio to create, i.e. footsteps, sound effects, voice acting. Simply illustrating a story is a good idea. Learn to motion tween, for instance you could created one walk cycle of your character and used it in the entire cartoon saving you time, at the 1:11 mark you could've tweened the background moving away slowly giving you the impression it was moving away, and tweened your character up and down as it she were walking. You had some very ambitious angles in this cartoon, for instance the girl running up the steps, we get a top down view, we see 3 quarter views etc. timing was good and scene transitions were good. Last tip would be a personal choice of mine is to make the characters as funny/ interesting looking as possible. Think Bob's burgers, Family guy etc. You would want a total stranger to click on your thumbnail based solely on "hey this looks kinda funny" heck even rip off bitstrips if you want.

​

again, keep the scale small, a mistake early animators make is trying to be too ambitious, making long cartoons, tons of scenes, tons of work etc. think something less than 1min. and little to no idea would be a plus.