many plots together from different df in Python

fig = plt.figure(figsize=(100,80))
sns.set(font_scale=12.5)
legend = ["2019", "2020", "2021"]
colors = ['yellow','blue', 'red']
i = 0
for frame in [month_total_Amount_2019, month_total_Amount_2020, month_total_Amount_2021]:
    plt.bar(frame['TransactionDate'], frame['SapExtendedValue'], color = colors[i], alpha = 0.4 )
    i += 1

plt.xticks(rotation = 90)
plt.legend(legend)
plt.title('Total Sales Application level 2 Category in 2019, 2020 and 2021')
plt.xlabel('Transaction Month')
plt.ylabel('Total Sales')
plt.show()