How to increase the size of a png picture for the heatmap of the correlation?

[lulu43366]

Did you try it? If I capture a 3x3 plot at 100dpy the image is 300x300 pixels. At the 1000dpi the same image is 3000x3000 pixels

With a DPI of 1000, you can see that it doesn't change. I can't see the labels.

from pandas import read_csv
import matplotlib.pyplot as plt
import seaborn as sns
import numpy as np
import numpy.ma as ma
import pandas as pd
 
dataset = pd.read_csv('Santé3.csv', sep= ';', encoding='latin-1', index_col=0)
dataset.drop(['Dynaverage'], axis=1, inplace=True)
corr = dataset.corr()
plt.figure(figsize=(200,30))
plt.subplots(figsize=(15,8))
sns.heatmap(corr, cmap='coolwarm', vmin=-1, vmax=1, annot=True, mask=mask)
plt.savefig("correlation.png", dpi=1000)