The phrase "able to devote more" is correct and usable in written English.
It can be used when discussing the capacity or willingness to allocate additional time, effort, or resources to a task or responsibility.
Example: "With the new schedule, I am now able to devote more time to my studies."
Alternatives: "capable of dedicating more" or "able to allocate more."
After retirement he was able to devote more of his time to his many hobbies.
Schools will save money and they will be able to devote more time to teaching.
I hope that in his second term he'll be able to devote more attention to the Great Inflection.
"He was able to devote more time to our family, to the arts and to various philanthropies.
India is now able to devote more of its limited supplies of domestic uranium to weapons production, letting imports cover more of its civilian needs.
"The reason I am leaving is to be able to devote more time to my campaign for mayor," he said in an interview.
The ancient Egyptians were thus able to produce an abundance of food, allowing the population to devote more time and resources to cultural, technological, and artistic pursuits.
Furthermore, Father Sullins says, there is the practical belief that "if a man's not married, he's able to devote himself more fully and exclusively to his parish".
Mr. Gilmore said that now that he is stepping down full time as governor, he will be able to devote far more time in the office at the Republican National Committee.
He was thus able to devote even more time to literary activity and to cultivation of personal friendships not only with Steele and other Kit-Cats but, for a short period, with Jonathan Swift until Swift's shift of allegiance to the rising Tory leaders resulted in estrangement.
And while the children are playing and learning, their parents are able to devote themselves more fully to rebuilding their lives.
