increase font size in varlmPlot

I need to increase the axis size to improve the graphs resolution, can anyone help?

dados <- read.csv("Amazônia_ILPF1.csv", sep=";", header=TRUE)
colnames(dados) <- N
dados[,44] <- as.factor(dados[,44])
dados <- data.frame(dados)

png(filename = "AM_ILPF.png", width = 480, height = 480, units = "px", pointsize = 12, bg = "transparent")
varImpPlot(RF1, main="SAF")

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