There are several effective acne scar removal options for the depressed scar on your nose.
In my experiences, a combination of scar removal treatments will give you the best results.
The most suitable treatments for your depressed scar are Fractional CO2 Laser, Subcision + Filler. You might also need TCA cross. At least 2-5 treatment sessions might be necessary to lift the scar.
Do note that the final results of scar removal treatments may take several months to years to materialise - patience is key!
For more details, you can check out this Guide to Acne Scar Treatment Costs in Singapore.