If a lawyer has been hired in the first instance, the same lawyer must be hired in the second instance, because only in this way can we better understand the situation of the case and various problems in the trial process.
If you don't ask a lawyer in the first instance, you should ask a lawyer in the second instance, because the second instance is final, and it is meaningless to appeal to the second instance. It is prudent to ask a lawyer to be more professional.
Unless your financial situation does not allow, you should invite them.