W/A Brother.
You drove the car on mineral oil first and then change it to Synthetic. Hmm.... it should be reverse-side infact. Because Fully Synthetic oils are for new Cars usually in Pak. (drove upto 50~60K). After that people shift to Semi Synthetic oils upto 120~130K and after that they come on Mineral oils and keep using it for rest life of the engine.
Altis 2011 59K seems medium life engine now because you were running new car on Mineral oil.
I don’t like the local oils, hence my recommendation goes for imported oils
Liqui Moly MOS2 10/40
First time, change it after 4K only. And if you feel car is happy, then next time change it after 6K.
Or
If MOS2 10/40 suits your car and mileage is improved, then next time you may try Liqui Moly's Synthoil 5/40. First time, change it after 4~5K. But next time 8K for sure (but change both filters after 4K).
If you are ok with Synthoil 5/40, then keep using it and change it after 8K till your car runs 100K.
After 100K can discuss again depending upon the car situation & condition.
Or if want to keep using Mineral oils then first choose ZIC M 15/40
First time, change it after 3.5K only. And if you feel the average mileage is improved and car is happy, then next time change it after 4.5K.