When you don't have a track record as a songwriter, it might be tough to approach a renowned musician. These musicians typically employ songs written by established songwriters, or they create the songs themselves or collaborate with the album's producer. Many times, they will not even consider writing songs for themselves. However, if you have some solid ideas and can express them in a compelling way, then they may be willing to give it a try. The best advice I can give is to not worry about what kind of track record you have and just write what you feel like singing. If someone hears something they like, they may ask you to write more songs like that one. Just remember that when you first start out, anything you write will probably not be used. As long as you're having fun and expressing yourself, that's all that matters. The most important thing is that you keep writing and performing. No one became a famous singer overnight so you need to put in the work. Practice your craft every day and share your music with others. They may just come up with a hit song next!