Alexey Z. answered 08/06/26
Russian Mother Tongue, English-Russian Bilingual, Expert Teacher
Your question, rephrased, is "How can I add words to my active vocabulary, which are already in my passive vocabulary?"
Look up synonyms of the word you want to add to your active vocabulary.
Think of situations and expressions where you use (the same) words in your active vocabulary.
Replace the latter with the synonym you want to start using actively.
Practice saying the phrase. Repeat.
An example in Russian / На русском
You have in active vocabulary:
Это знающий профессионал.
Replace it with the words you want to add to active vocabulary
Это компетентный профессионал.
Это сведущий профессионал.
Это грамотный профессионал.
Это опытный профессионал.