Singh, 22, joined Worcestershire from Nottinghamshire on a three-year contract in November 2024 after having a loan spell at New Road in the One-Day Cup that summer.
He made his first-class debut while on loan at Northamptonshire in September 2024 and played twice in the County Championship last season.
Singh has been used predominately in white-ball cricket by Worcestershire, appearing in 28 matches across T20 and List A games so far.
Richardson said he believed +Singh would continue to master his craft.
“With any cricketer, but certainly with spin, it’s an evolution and there’s a real art to it,” he added.
“You’ve got to master that and a lot of stuff tells you spinners develop but it just takes time.
“Fats and a lot of young spinners around the country don’t bowl a lot so for them to suddenly be thrust into a game and have to bowl 40 overs and try to win us a game can be incredibly taxing.
“I think Fateh can still bowl a lot better. There’s a lot of stuff that was probably not quite where it needed to be but he also created opportunities for us.”
Worcestershire’s victory, their third in eight matches so far, took them 22 points behind second-placed Kent.
The Pears are not back in red-ball action until 20 August for the final block of six games with attention now turning back to the T20 Blast and then their defence of the One-Day Cup.