Greetings! My two go-to saints for everything are St Thérèse of Lisieux and Pope Saint Paul VI. (A family member received a miracle healing she attributes to the intercession of our sainted Holy Father). After long experience, I rely on these two for intercession for any need, however small.
As you may recall this pope was baptized on the day the Little Flower died. She said when she died she would appear at the baptismal fonts of little babies. The pope felt a special affection for her and kept a relic of her on his desk.
To me, these two kind souls are connected, and I truly believe they will be overjoyed to assist us and pray for us.
I recall a wise priest saying, “Sometimes you choose your saints and sometimes they choose you.” For me, it was the latter.
I think what makes a saint “the right saint” is having an affinity for them in some way, be it their charism or personality, faults and struggles, or even a quirky attribute.
Romano Guardini writes about how a relationship to these “friends of the soul” may become deeply personal and lead one closer to Our Lord in his excellent book, “The Art of Praying.”
(Sorry for all the edits. First day on the forum and not quite on the ball).