Coronavirus is kinda a big deal at the minute and people love to read, talk, moan, complain and celebrate coronavirus/lockdown. So literally anything with coronavirus in it is relevant and you don't need to be too picky with your coronavirus topic. I would recommend focusing on a topic you are interested in and tack on coronavirus somewhere (preferably in the introduction). However if you want something more long term, do a meta analysis of coronoavirus in your chosen topic. As coronavirus analysis is such a novel topic, you can probably research whatever you want.