Any conversation starters ideas?

I'm talking to a girl who's really nice and cute, we met on a dating app and kinda have this implicit agreement where we talk for 1-2 hours every day about something and once we both don't know what to say anymore we stop talking (so that we don't get sick of talking when for no reason).

I'm just scared of starting the conversation every day because I don't wanna sound annoying or desperate to talk to her... any ideas on cool stuff I could talk about to start the conversation? :)

(We already talked a lot about video games and series/movies...)
Any conversation starters ideas?
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