I am a PhD student in computer science at a German university, working remotely on the PhD. I do not get much support from my professor (anymore) in terms of time for discussions and I have little to no relation to the other PhD students. Before Covid-19 I would travel to the city in which the university is located, but even those (few) travels have stopped. I would like to discuss scientific questions and topics with other researchers, as in having sparring partners. What are other ways to find groups or individuals, e.g. online? I am not aware of options.
PS: I am not sure what good tags are for the question, maybe someone can help.