Here's the thing with crushing on a friend
It is impossible to be more than friends without risking the friendship
You either have to go for it or give up on it, there's no magic middle ground where you can kinda sorta hint at it and if she's not interested then she can ignore it and you'll continue being friends.
If she does like you she probably feels similarly where she doesnt want to risk the friendship, which means that if you only hint at it she is going to be unsure whether you're serious, and she may decide not to take it seriously just because she doesnt want to fuck up your friendship, and then you won't know if she acted that way because she doesnt like you or because she is also insecure ETC ETC
You either have to decide it's worth the risk and clearly/confidently make your intentions known and put yourself out there, or give up an find a way to get over your feelings for her so you can really be platonic friends.
One thing I will say is that you need to do one or the other, don't keep being friends while you have feelings and hope they'll just go away because that shit will eat away at your soul. You need to take steps to get past the feelings or act on them.