英語で「私はしばしばJポップの歌を歌います」は？

I frequently sing J-Pop songs.

This sentence is clear and concise, and it accurately conveys the meaning of the original sentence. It is also relatively informal, which is appropriate for a blog post or other casual writing.

Alternative options:

• I often sing Japanese pop music. This sentence is more formal than the first option, and it may be more appropriate for use in a more academic setting.
• I regularly perform J-Pop songs. This sentence is also more formal than the first option, and it may be more appropriate for use when describing a professional performance.

Ultimately, the best option for you will depend on the context in which you are writing.