Your first season in ranked is the easiest ever they will rank you higher than you deserve everytime. Next season you will get ranked very low since you were bronze 1 this season. If you go 5-5 wins You will most likely get bronze 4-5 this next season after your 10 placement games. But a player in gold would do promo games go 5-5 wins and get placed around silver 3-5. When you are a new account they give you a higher placement to start you a bit more in the middle and let you fall/climb from there. That is why after only 1 win you are still placed as high as bronze 1.