9 months muscle imbalance progress (Negligible difference), Whats wrong?

20M 5'9" 75kgs Going to the gym for about 1.5 yrs now. The white shirt pic is the after one(if you couldn't tell T_T)

In these 9 months my strength has increased by a lot, went from benching 60kgs to 80kgs. As you can see I have a stark muscle imbalance, so i asked for you guys' advice 9 months ago about my imbalance.

Since then I've focused on unilateral Exercises and always ended my set with my left arm being the last rep. This most definitely increased my lefthandp strength and bridged the gap between both hands in power( not fully tho my right is still slightly stronger)

Also the only difference in diet I made is that now I take whey so that ensures my protien intake is much better than before.

But visually there's no difference and that irks me the most.

Please guide anything that i should change Or just be patient and keep going🙏