The all-rounder's first ODI since serving a three-and-a-half month suspension handed down by the Bangladesh Cricket Board for "serious misbehaviour" saw him score 101 and snare 4-41 in the hosts win on Friday.
The 27-year-old, who collected 18 wickets in Bangladesh's recent 3-0 Test series rout of the Zimbabweans, said he felt he has improved his temperament on the field.
"Now I feel that I am calmer, especially while batting today and throughout the Test series," Shakib said.
"I was relaxed and calm. I think this caught the eye. It is difficult to say specifically [what has changed], but I can feel it.
"Maturity is important. I think that works for me. I have to continue with it, not just a match or two. I think from now on, I can't make any of those mistakes.
"When I think of my career that has gone by, there is a bit of regret. I didn't bat as well back then as I am doing today.
"I thought that if I use my head a little more, maybe I could have scored 500-1,000 runs more, had I batted like this in the past in Tests and ODIs."
Shakib, who took just 95 balls to chalk up his ton in Chittagong, said he feels more confident of finding quick runs in the one-day format after his first 50-over century in four years.
"There was no specific plan," he said, after coming in with Bangladesh at 31-3.
"But it was important not to lose wicket at that moment, and building a partnership was necessary.
"I have the confidence that if I stay at the wicket longer, I have the ability to cover for the deliveries.
"These days there is one extra fielder inside the circle, so there are more gaps. You can [lift a strike-rate] at any time if you are set on a good wicket."
Zimbabwe lost the ODI opener by 87 runs, and will want to work on their batting partnerships - after they failed to produce a 50-run stand as they were bowled out for 194.
The African nation also needs to improve in the field, after twice dropping Mushfiqur Rahim - who went on to make 65 in a 148-run stand with Shakib.
Elton Chigumbura's men simply just need to start winning ahead of the World Cup starting in February, having triumphed just once in their past 10 ODIs.
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