Welcome @Turbo98
In terms of form, there are a few small errors to correct, but in terms of content, I find the letter beautifully done. Well done!
If you explained your study project as well during your Campus France interview, there is no reason for them to give you reason 4. Now, there remains reason 5 (more common than reason 4) and reason 2 (funding your studies).
What are the tuition fees at this institution? You need to take this into account. You can clearly state that you have the necessary amount to finance both your tuition fees + living expenses.