"strictly through" is correct and usable in written English.
It usually means "only by means of" or "solely by way of". Example: I was able to get through the tough project strictly through my determination and hard work.
He presents it strictly through the eyes of a bright 18-year-old kid.
Actually I do prefer to be defined "strictly through my work".
Some of the big success they had, it was strictly through Ike that they had to get it done.
By the eve of the disc's release, online orders had brought in $33,700, strictly through word of mouth.
"Some of the philosophy has changed because there are more quarterbacks available than just strictly through the draft," said Tom Donahoe, the Buffalo Bills' president and general manager.
Although he can get down to the grind, there is a feeling of "Don't underestimate me or define me strictly through my work".
National assets should only be sold as part of a long-term plan that is strictly followed through.
The global movement of nearly every other form of weaponry including nuclear, chemical and biological weapons is strictly controlled through international treaties.
"It provides an expanded area of protected habitat for the wildlife where tourist numbers are strictly controlled through our formula of no more than 12 guest tents per camp and a maximum of 1 tent per 700 acres and 1 tourist vehicle per 1400 acres.
On Monday, on the steps of City Hall, she held a press conference introducing SheTaxi — known as SheRides in the city, where using the word "taxi" is strictly regulated — through which female passengers, via an app, can request a pickup from one of the female drivers at Mateo's affiliated bases.
The activities of protein kinases are strictly controlled through a diverse set of mechanisms.
