A lot of the explanations you provide are, in my opinion, important to include, but they are repetitive and therefore too long. The challenges you have faced in addition to those we are all facing with COVID, are truly horrific and I am so sorry.
I can help with the letter tomorrow if I have time. But want to make a few other comments. Are you sure that returning to your university is the best course, first of all? If you do not have to work, that is good, but are you going to have large loans? Can your parents afford it?
Second, if you were depressed, you should have considered a medical leave, which in some cases can wipe the slate clean for grades. In fact, in some cases, you would not get any W
s forwithdrawals and your transcript would be clean.
Did anyone suggest this to you? Your therapist?
If you do return, make sure to register with the Office of Disabilities with documentation of your depression. This would entitle you to accommodations like extensions on assignments.
You had COVID and the school did not accommodate you with extra time for work?
Between the financial situation, worry for your parents, homesickness and isolation during a major pandemic, language issues, COVID illness, the need to work, and depression (no wonder!) I really feel for you, and wonder if you might consider talking with a dean or other administrator about a medical leave instead of a suspension. Ask your therapist for support on this.
ps One of my kids teaches and has run into a lot of situations during COVID like this, and my prof. kid has accommodated many without formal registration with any office of disabilities. These are extraordinary times requiring extraordinary kindness and flexibility. Did noone help you during these struggles?