Well, if you’re praying on behalf of your family member or your pet that may be a different thing, but if (say) St Thomas More is patron of lawyers and I’m a lawyer that makes him MY patron - he’s praying for all lawyers, including me, whether I know it or have asked him for prayers or not.
And as a resident of Cleveland, the city’s patron saint (John the Baptist) is praying for you too, so he is your patron.
I guess as a writer/Journalist it would be St Frances de Sales, but I feel much more affinity with St John of the Cross, whose prayer life and approach to God I feel very strong resonance with in my own soul.
Ok the best way for me to explain, is to explain how I came about mine. My confirmation saint is St. Helena. I chose her for many reasons that were personal to me when I was 16. Now at 32, I am in the IT industry. My patron saint for this is Saint Expedite. I find that he really delivers. St. Expedite’s novenas start on Wednesday with a red candle and a vase of flowers. By Thursday morning I had been accepted into an important internship conducive to my career. It was exactly what I needed, being a poor college student about to graduate, I needed pertinent work experience as well as money. This internship gave me both. St. Expedite works pretty quickly and all he asks is that you tell others. So here I am. The best way is for you to look at what best suits you in terms of who calls you, needs, and personality, the above post is a great way to go about it. There is a database of saints to look at on catholic-forum.com/saints/indexsnt.htm, click on list by name or topic and get to town with it! This database is excellent. Hope this helps!