@ boomboomabc I really liked what you started on the MHA story. If it's still possible, maybe just get back to your original plan. It'll probably help, and if you're unhappy with it, instead of putting it on the side, try to change its directions and improve the parts you have a hard time figuring out. The best way to fight against writer block is probably to have a plan and know where you are going, if you can't get yourself to write, then try working just on the plan and the direction of the story's development. Also, a story doesn't have to be long, if your ideas can't get it to be long as you would have wanted, it's fine
And for your WoF story, maybe you could try changing the events a bit more, or more like in the way they unfold. Sometimes, it can feel like Stormcaller is just following along, it doesn't always feel like he is impactful to the dragonet's story itself. The relationships and bonds are well made, and the way Stormcaller himself is evolving is very well done, but I think you can give him more impact on the timeline itself. And don't hesitate to take some freedom, who knows, maybe some events can happen completely differently ;)
Here, I hope this helps