Q: What should I do if my manuscript has been stuck at the ‘Editor Assigned’ status for a month?

I submitted to a BMC journal, but the status has been ‘Editor Assigned’ for a month (since March 7). I used the journal’s Research Square feature and found that manuscripts also on bioinformation that were submitted at the same time as mine or even earlier have been sent for review, but mine is still stuck at ‘Editor Assigned.’ What is going on? Should I write to the editor?