Replace, then, next, and, with, second, last, at the same time, as mentioned above, and so on.

Generally speaking, it will be changed to summary. The above analysis shows that, for example, students are required to design a scheme, send it to the network platform for discussion, and then determine the best design scheme. Instead, students are required to design a scheme and send it to the network platform for discussion, and then determine the best design scheme.

Read more good articles written by predecessors in your thesis field, pay attention to how they express what you want to express, and directly find high-level papers in this field as templates to imitate writing. Be careful not to copy, but to imitate their writing structure and wording.