Sure, it’s not a complex relationship.
Wavespeed (m/s) is frequency (Hz) multiplied by wavelength (m)
You may have seen the triangle method (or know some other way) for rearranging (transposing) this equation, you will certainly need one, so if not message me / ask again and we’ll get that bit sorted too.
Oh, just re-read the question. The frequency (or wavelength) increasing on its own would raise wavespeed. Generally though, what happens is one rises as the other falls to give a constant wavespeed in any medium.