I would echo this. Robin is a strong core for your follow-up team but is also a 5 star harmony that works in a variety of different teams, so she would be good for your account. :)When you need both Robin and Topaz to make the best FUA team and both are on the same banner. That's rough. Idk which is better to pull for in this situation. Though maybe Robin then you can do Aventurine, Ratio, Clara, Robin.
Besides that Himeko and Herta are worth getting to 80 and leveling up traces, gear just for Pure Fiction.
Or you can wait for Sparkle to get released and use Sparkle/Ruan Mei/Trailblazer/Sustain.