Depends...

[haele]

Gerrymandering to turn a blue or purple district red means that the Red State needs to dilute red districts; deep red districts go mostly red, mostly red districts go purple red, to turn purple blue districts purple red
It can actually dilute the primarily red districts, which can be really risky if the public in general is unhappy with the Republican policies.
On edit -
Most Red states are already gerrymandered to the maximum Republican benefit; trying to turn just one blue district could result in two or three blue districts if they take the potential voters of the surrounding districts for granted based on previous elections.