I have no doubts about Fatima or Lourdes but I am not comfortable with Medjugorje due to the Church’s skepticism. But as others have said you don’t have to believe in private revelations.
One has to examine and decide what are the most essential parts of the Lourdes, Fatima etc industries.
Maximin was pressured into changing his tune, but that doesn’t alter what we fortunately have on what was shown him for whoever it was shown him for.
Scepticism around some “packages” may be partly due to fluctuations in the stance of some participants (under pressure), then other parties adopt a political stance regarding the package. It all gets complicated. Approval or not governs the status of diocesan or parish trips to such places. When bunches of individuals go privately without parishes lending any endorsement, they are free to pick & choose whether they see core elements which they see as relatively inspiring - as far as I understand. And it does get very difficult to filter out the core elements, even in a place like Lourdes.
The heart of the Lourdes message is to repent which isn’t often discussed.
The purpose of “private revelations” is to help whoever chooses to interest themselves in them, to apply the permanent public revelation to life in current circumstances. What are called prophecies in I Cor 12 and Eph 4 have the same function and may be smaller in scope.
They are very often addressed mainly to the Church itself.
It is because of the first war that my grandparents turned Catholic and my other grandmother met my Catholic grandfather, and because of the second one that my mum met my dad.
So remember what they say about an ill wind - and stick with those who get the deepest meaning from
all the Scriptures, both with
and without what anyone may consider the most core features of various private revelations.