Definitely you add new research article and also remove uploaded article . Better to keep the both the article if you have no issues

Pantip Sangprasert No one can provide a definitive opinion or recommendation on whether you should remove or keep your Thai research article from ResearchGate. This is a personal decision that should be based on your professional goals and the audience you aim to reach.

However, you may want to consider these important points while making your decision:

1) If your primary goal is to connect with a global, English-speaking audience, replacing the Thai article with two English articles would be a sensible choice. On the other hand, if you wish to engage with the Thai-speaking academic community as well, it may be better to retain the original article.

2) Removing a publication can sometimes be seen as reducing your overall publication count. Keeping all your work, regardless of language, can demonstrate a broader range of research interests and productivity.

3) ResearchGate allows you to upload multiple versions of a paper and to add new publications without removing old ones. You can upload the two new English articles while keeping the original Thai article. This would make all of your work accessible to a wider audience.

Thank you very much for your recommendation.

This will be your personal decision You can upload your research work or can delete ur previously uploaded research work