Why my axis text is cutting in corrplot?

Hello, I am trying to produce a graph by using corrplot command, but somehow axis text is not showing fully and also how to set margin, as there is a lot of white space between plat and boundary of image.
Here is my code:
library(corrplot)
tiff(file = "allvariables.tiff", width = 2000, height = 2200, pointsize = 10, units = "px", res = 500)
corrplot(var$contrib, is.corr = FALSE, tl.col='black', cl.align="l", mar = c(0.2, 0.2, 0.2, 0.2))
dev.off()
Annotation 2020-08-02 124024