How to make my subplots larger? I tried playing around with figsize but it just squeezes everything

Question

sample

This is my code:

fig, ax = plt.subplots(nrows=21, ncols=2, figsize=(15, 40))
ax = ax.ravel()
    
for n, col in enumerate(categorical_cols):
    g = sns.boxplot(data=train_df, y=col, x=target, ax=ax[n], orient='h')
    ax[n].set_title(col, fontsize=10)
    g.set(xticks=[0, 100000, 200000, 300000, 400000, 500000, 600000])
    g.set(xticklabels=['0k','100k','200k','300k','400k','500k','600k'])
    plt.tight_layout()

I'm trying to enlarge each of the subplot but I don't get any result by increasing figsize or decreasing figsize, would appreciate any help. Thank you!