Pakistan pounded the hosts by seven wickets in the fourth one-day worldwide in Colombo on Wednesday to take an unassailable 3-1 lead in front of the last match in Colombo on Sunday.
The win supports Pakistan's possibilities of fitting the bill for the 2017 Champions Trophy in Britain however Miandad said the group must proceed onward from the irregular flightiness of the past.
"Our group is solid now yet we require reliable take a shot at it in light of the fact that we ought to have a place with the main four. Nine-eight in the rankings is not our position and for that reliable work is required," said Miandad, one of Pakistan's most noteworthy ever batsmen.
Miandad cautioned different groups were enhancing quickly and Pakistan must fare thee well not to slip back.
"We need to contend at the top level and with groups like Bangladesh and Britain demonstrating incredible change we need to lift ourselves so we can rival groups like Australia, South Africa and India," he said.
"Bangladesh has demonstrated their ascent by beating groups like Pakistan, India and South Africa so cricket is changing and to be in that race we need to rise reliably and stick to nuts and bolts which we had not been doing."
Bangladesh rose to seventh in the ICC rankings in the wake of pulverizing arrangement wins over Pakistan, India and South Africa in home one-day arrangement since April this year.
Another previous skipper, Inzamam-ul-Haq, lauded the group's dynamism, after some strangely athletic handling helped them to triumph over Sri Lanka.
"Pakistan have indicated they are an energetic group and has demonstrated change in each of the three offices and that is a decent sign," he said.