Planning to invest in a DoT team, looking for advice

Haven't really invested in DoT but planning to do so. I'm thinking of getting Kafka and Black Swan but I'm unsure whether to get Hysilens or not. I know she's good but I'm wondering whether there's other options for DoT or if she's really needed for the team to work.

I have E1 Jiao Qiu that I got back in the day but I don't really know if he would be good in a DoT team now. I've got Silver Wolf base form and the recent MBlade as well if thats any useful for DoT.

Another thing is for sustain, would I use a Preservation unit with Trend? So like example DHPT/Aventurine using Trend or is someone like Huohuo better for DoT?