There’s not much I would change. Add another reading, either from the Old or New Testament depending on what’s already in the Mass of the day. I think borrowing the Litany of Peace from the Liturgy of St. John Chrysostom as the text for a type of Prayers of the Faithful would also be of benefit.
Also, I wish there were the option of the Canon being prayed audibly by the priest. When I hear the Roman Canon in the Novus Ordo despite being poorly translated, it’s absolutely wonderful and helps me focus better on the Holy Sacrifice. The silence sort of distracts me, but it helps others to concentrate so I wouldn’t push too hard for this.
In my opinion the language of the Mass doesn’t matter, whatever language it’s in it’s the same Mass. As long there’s a missal to read the propers, everything’s okay. After a couple of masses the ordinary is basically second nature.