You can’t meet people in person, so learn to meet them online. Learn to use social media so you can keep in touch with friends. Learn to use FaceTime (on Apple devices), Skype (on other devices), Zoom (for group chats). These systems all let you see your friends as you chat with them on your smartphone.
Make it fun! Have a virtual tea party! Pick a time, get spruced up a bit, have your tea and cookies ready and share your cuppas over a video chat.
If technology is not your thing, phone your friends. Phone to say hi. Phone to ask if they’re ok. Let them know they can call you to talk. Call to let them know if you’re NOT ok.