If you have an active ad, you can get it ‘Featured’ on OLX. It's super easy and nominal!
Step A: Go to My Ads at bottom right of home screen
Step B: Select desired Ad > Tap "PROMOTE" option
Step C: Next, decide the featured Ad plan
Step D: Choose a suitable payment mode and you will be directed to the payment page.(can also avail OLX credits if you have any)