Language input is key! That is, reading and listening. You should be reading as much native level content as you possibly can. Over time, you will acquire vocabulary and sentence structures such that they feel nature to you. I would recommend reading into Stephen Krashen and his “Comprehensible Input” research. (I own a Chinese language learning app called JinbuPal and we heavily utilize these techniques.)
The best way to improve language skills will vary depending on the individual's fluency and language proficiency level. However, some general tips that may help include:
-Practicing regularly.
-Using resources such as dictionaries and learning materials.
-Engaging in interactive activities such as speaking with native speakers.
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