However,to re-add your five publications to your profile, start by logging into the relevant platform where you manage your academic works, such as Google Scholar, ResearchGate, or your university’s repository. Once logged in, navigate to your profile or publications section and look for an option to add new publications. This might be labeled as "Add publication," "New entry," or something similar. Click on this option and manually enter the details for each of your publications, such as title, authors, journal name, publication date, and DOI. Some platforms may also offer the option to import publications using BibTeX files or directly from other databases. After entering the information, ensure that you save your changes. If you are updating a personal website or CV, open the document or webpage for editing, add the publication details in the appropriate format, and then save and publish the updates if necessary. For databases like ORCID or Scopus, follow a similar process by logging in, locating the section to manage publications, and adding the necessary details before saving your changes.
I doubt that you removed these publications completely from ResearchGate - as far as I know, it is not possible to delete 5 entries at once. You just have to find them to claim authorship to re-attach these publications to your profile. Search for the titles at https://www.researchgate.net/search.Search.html?query=&type=publication and follow the instructions in the section "How do I confirm authorship of my publications to add them to my profile?" in https://help.researchgate.net/hc/en-us/articles/14293005132305-How-to-add-research.