Canadian Stroll failed to score in the first six races of the season, but after breaking his duck with ninth place in his home grand prix, Stroll has now registered three points finishes - including a podium finish in the Azerbaijan Grand Prix in June.
"There were some very difficult periods, but actually I feel he's cracked it now and we can only really get better from here," Lowe told Autosport.
"Now it's the confidence of the podium, even when he is having a really bad day you have something to lean on and go 'you know, I did that on that day and I can do it again'.
"He is racing really well. He shows great maturity on race day, that was no more clear than in the race in Baku.
"He kept his head, stayed clear of trouble while still maintaining good pace. That sort of maturity normally takes some years to become apparently, so I think he's showing great promise in that respect."
Lowe believes Stroll can emerge as a formidable grand prix driver if he continues his current rate of improvement.
"It is just incremental [learning] in the car over the next one to two years," said Lowe.
"If he keeps up that rate, he will be showing himself to be very strong and showing himself to be a very strong competitor."
Stroll said Lowe had been a calming influence and that his realism had helped the teenager's learning process during his maiden campaign.
"Paddy and I get along very well," said Stroll.
"I have a lot of time for him, he's a great person to have in the team, a great leader.
"He's a realistic guy, and I really respect that. "You can't put your expectations through the roof. If you surprise yourself, great, but if you don't then just work from there - any other mindset would be wrong.
"If you expect to come in and blow everyone away at 18 years old, that's a bit ambitious.
"The realistic mindset, being in the process, taking it weekend by weekend, concentrating on one thing at a time, that's the best way to compete.
"If you let emotions into it and start getting ahead of yourself, it normally goes downhill from there."
Source : https://au.eurosport.com/formula-1/stroll-has-cracked-f1-lowe_sto6282810/story.shtml