Nandor I recommend trying the feature 'Import GitHub starred repositories', at the 'Import/Export'-tab in Obtainium. If you know the name of any github account, enter it, if the account has starred repos, it would show a number of available apps that you get to directly add to Obtainium. (Try mine if you like, my account name is Novaliss)
It helps having a github account with a personal access token, so the allowed number of github connections per hour gets higher.