Employer ghosting is frustrating to say the least and not a good business practice.
I believe recruiters sometimes are inundated with applications and interviews and inevitably ghosting can happen.
I like to use post-interview follow-ups as opportunities to both thank the interviewer for their time and reiterate interest in the role, but also use the opportunity to nudge the interviewer to take action and keep yourself top of mind with them.
So let's say you have an interview Tuesday at 10am - thank the interview at the end of the interview for his/her time and close the conversation by telling them how interested you are in the role and ask for a timeline for next steps. The next morning email them a quick thank you note, but make it personal; include something specific you spoke about or connected on during the interview, remind them why you would be a good fit for the role, and reiterate the next step that they gave you, eg looking forward to our next touch base conversation on Monday the 12th or whatever they noted as the next step. Then be sure to follow up with them at the time of the next step they gave you. If you didn't hear from them on Monday the 12th as discussed, send them a note around 3pm that day letting them know you were expecting to hear from them and you are still very interested in the role.
Here are a few articles on the topic that I find helpful: