If Prevost and his VII predecessors are legitimate popes than you MUST submit to their authority and all the doctrines they promulgate.
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Who in reality has the authority to determine who is a pope or not? There's the rub.... I am shaking dah Σpear !
Some council, or maybe a dicastery...at least some religious (think St Catherine of Sienna).
Once you realize that lay folk are 99.99999% at a loss to ascertain if Pope Leo XIV is Pope or not, or if the previous 6-7 popes were real popes or not, then you MUST pray for the Pope!..in this case for his return to Tradition/doctrine. R& R Catholic faithful don't obey the Pope when he promotes Modernism or vice etc, we must firstly obey God's commands before men's. I haven't read much about Leo's famous trip to France, but he tries to put the brakes on abortion and M.A.I.D. (Assisted s*ic1de). The Church needs many many prayers and sacrifices. As Bossuet said: Il faut que ça coûte! [No pain - no gain , sortof] Prayers take effort, Sacrifices take courage etc.
When JP II visited Canada in Sept '84, I had no desire to see him. Fr. Yves Normandin did see the Pope and joined the N.Ordo church, and told all the couples he had witnessed for their marriages , to get regularized by the bishops... Modernism is a contagious disease, as per +Lefebvre. I think he even stated that the mess in the Church is not his problem: it is God's problem: God always triumphs!!!
Point is: Pray for the Pope, and simply do God's holy will to enter heaven eventually...