[Goal][Ask]I'm max TH7, upgrade to TH8 will be done on Monday. Any suggestions on what to upgrade first?

I already know that all my saved elixir is going into upgrading the laboratory, then dark barracks, and all gold will go into upgrading all new defenses to TH7 level, then into walls. I just want to ask which troops (after dragons) and defenses (after walls) I should upgrade first. I think I want to do lightning spells and ADs early.