You can’t pray wrongly. Be at peace. Just pray as it works for you.
God sets no rules about praying, except to pray
We are not to fall for any prayer peer pressure to pray a certain way. I was recently at the funeral of a 97 yo. In her eulogy, it was said how she had outlived all her friends and contemporaries. This took all the peer pressure to conform away from her. And it was such a grace in her old age.
It’s not important how anyone else prays the rosary, it is only important that you pray and have your conversation with God through your prayer.
Its also totally acceptable to focus solely one one theme and meditate on that through the Rosary, a few themes or all of them.