Drop the humidity in your tent. Cannabis plants make trichomes as a defense mechanism against pests, but they also create trichomes to clog pores and retain moisture.
Other than that, there isn't really anything you can do at this stage. Some people say to leave the plant in 48 hours of darkness, but i'm skeptical about that making more terpenes. It doesn't make sense to me and i'm starting to chalk it up as bro-science. I'm pretty sure a trichome takes longer than 48 hours to form, so claiming that a period of darkness will increase trichomes is suspect. But, I've never tried it, so i could be wrong.
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