Hi, I want to amplify the promoter region sequence in 3 species in the same Jenus?

what i have already done:

designing the primers according to the Ref. Seq. for 2kbp Upstream the CDS region.

amplified the promoter from species 1 and 2 using HiFi polymerase.

the sequences' identity was very high from 1 and 2 (95-99%).

But, the problem with species 3 no band in the length of 2000

I re-designed the primers until i get the required length band

But after sequencing the sequence identity is too low (40-50%)

what can i do to amplify the promoter sequence from species3?

thank you

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