Turn on your device you plan to stream the music on
Open streaming service of choice(Apple music,Spotify,Soundcloud,ect).
If you have heard a song you like on tiktok look into the artists discography. Also under the artists page it will show similar artists. Look into them and you will be set.
If you want to try rap i suggest you try two different types of rap. First type: underground(Che,Osamason,Xaviersobased,Glokk40spaz). Second type: mainstream(Playboi carti,Kendrick,J cole). I personally think underground is way better but it seriously does change with every person.
If you wanna try Alternative i suggest Panchicko,Wifiskelton,Radiohead. But thats just my taste.
I really dont know enough about the other genres to reccomend stuff but this was my guide to develop a music taste.