Do you have Valerian S3 max? Diting maxed out? Kazuyo the reverie S3 max and s1 (can be maxed out)
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fallow kindle
In early stage valeran diting and kaz will help your runs easy. I'm guessing your still in early on the game since you don't have a ling yet.
Late game stage SR would be viper and sania for sustain, obol and fangus for dot runs like inferno niconana and hoyan. If you can reach inf stages on module you can build as well SSR heinrich for constant dispel just like viper. It would help you land more damage on terror or any content since it is an LD unit.
slate dirge
For dispeling you can use heinrich without investment in the case you havent Invest in Viper for aurora
As Jae said you will have to build the dot team since you can advance pretty fast in end game content
I would Invest in the dot team right after building those characters diting, Valerian and kazuyo
Once you get lingluo her s1 max is vey helpful for aurora
Some people even invested in her s3