searching for an old friend. (please read & help if you can)

so in early 2023, i made some friends on discord. i really enjoyed talking with a girl from there but eventually, i just forgot about my online friends and i focused more on irl friendships (worst mistake). for some time, i tried finding the server that i used to talk to, but i couldnt find it its like it just dissapeared. last night i dreamt that i was searching for the server and when i woke up, i started searching more for, at least that girl i used to talk to. i found her dicord but i cant message her cuz she never added me. i found her tiktok also, thats my only way to message her. i sent her some messages like 12 hours ago but she never responded. she also wasnt active on tiktok since january. i tried commenting on one of her yt vids but my comments dont post for some reason. now i really dont know what to do and i really miss her. does anyone know what i should do now?