You can try looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, and you might be able to find some related to Michael Burnham being hurt. Just use the search function on the site.
One common theme could be her facing physical harm during a dangerous mission. For example, getting injured while exploring an unknown planet or during a battle with an enemy.
One way is through character development. Show how Ash's character flaws, like impulsiveness or a lack of communication skills, can lead to him hurting Michael. For instance, he might make hasty decisions without fully understanding the situation, which has negative consequences for her.
Well, it could be a story where Ash's actions are driven by misinformation. Maybe he believes Michael has done something to endanger the crew or a mission, and in his attempt to stop her, he ends up hurting her physically or emotionally. For example, he might accidentally cause her to get injured during a scuffle or say things that deeply wound her.
One possible scenario could be a misunderstanding between Pike and Burnham that leads to emotional hurt. Maybe Pike makes a decision in a mission that Burnham disagrees with strongly, and it causes a rift between them.
By showing the flaws in both characters. For example, Pike might have his own insecurities or biases that lead to him hurting Burnham. Burnham, on the other hand, might have her own expectations that are not met, causing her pain. This can make their relationship more three - dimensional.
One common theme is the exploration of Michael's physical and emotional pain. Since he's a powerful character, seeing him in a vulnerable state due to being hurt makes for an interesting story. Another theme is his friends' reactions. They often rally around him, showing themes of loyalty and friendship.
Sara Tancredi is a very popular character to be paired with Michael. Their relationship in the original show was complex and in fanfiction, it can be further explored, especially in the context of Michael being hurt. Another one could be his brother Lincoln, as they have a deep bond and Lincoln is often there to support or be involved when Michael is in trouble.
It could also be a new, unknown enemy. Maybe there's a secret organization that emerges in the fanfiction that has a vendetta against those with electric powers like Michael. They could target him specifically and cause him harm.
One common theme could be his emotional pain during his time in prison. For example, the isolation he felt from his family and friends outside. Another theme might be physical hurt he endures during his various escape attempts and confrontations with other inmates or prison guards.