While perhaps not the most effective use of time, you might consider offering an email appointment if the student is concerned about access to phone or WiFi, or has other accessibility needs that make email more successful as a communication tool.
If you and the student opt for an email appointment, you can instruct the student to write down all of the questions they were hoping to address during the appointment in one email message. The more specific the question, the better.
Questions such as, “What should I take next semester?” may or may not be answerable, unless you have confirmation that they are still following the same track as discussed during a previous appointment.
Since students are likely familiar emailing you with questions, there would be little learning curve for this option.