Don't rush on 4*, Download around 5000 beatmaps, sort them by difficulty and play them all starting at easy ones, don't skip stuff, don't retry more than a couple times. Have fun !
I bet you cant even fc a 3* maps or even play them, dude, you only have 8 hours; you could have created your account 10 billion years ago and that doesnt mean you can play 10* maps.
Just play, I think with like 20hours you will be able to comfortably play 3* maps and with like 50 hours you can start playing 4* maps and even fc some 3* maps.
a lot of people have this bizarre misconception that how long ago they made their account has anything to do with how much they've played or how good they should be.