Group chats: You may have course group chats created already, and you can also make these easily on MS Teams using your university account.
Shout-outs in lectures: Ask your lecturer for 5 minutes before/after a lecture to collect feedback. This is a great way to get quantitative feedback through a show of hands.
Online surveys: These are useful as they allow students to share both quantitative and qualitative feedback with you in their own time, outside of lectures and seminars. They may also allow students to submit feedback anonymously. You have access to Microsoft Forms as part of your university account, and can also use other platforms such as google forms or surveymonkey.
Noticeboards: Your departments may have physical notice boards, which you can ask to post on! You could post a QR code to an online survey, or even leave a piece of paper and pen for students to physically write feedback on. Just be mindful that people who aren't in your course year group may also use these noticeboard spaces.
Catch-ups/drop-ins: You can always have drop-in sessions with people on your course - you could host these online, or find a space on campus for students to come and meet with you. Try hosting a drop-in after a lecture or seminar to get the most out of your cohort's time on campus!
Email: You could send emails asking for feedback to your year group via your university email address. If your course cohort is quite big, you may wish to ask staff to send a message out on your behalf and include your email for students to get in touch with you.