I went to Paris the first time exactly 50 years ago as a backpacker, behind the backdrop of Nixon as president and Watergate, that stay of 5 full days forever hooked me on always going back to Paris and France, regardless how daunting it was, far more then than now. Then it was said Paris was a hot bed for pickpockets.
Twice prior to the 21st century I came close to being picked in the Paris Metro, ie, close means the attempt was frustrated, thwarted.
All the trips since 2001, re: getting picked , never happened. Never came even close on this trip 50 years later traveling as a senior citizen, the first post-pandemic trip, of a month or so in Paris and France, the last one was in 2018.
This time I made it a point of exploring the other train stations, St Lazare, Montparnasse, Lyon , Austerlitz (even exploring a few crowded , heavy-duty, Metro stations, eg, Chatelet , now that they have been refurbished, expanded, (except for Austerlitz, still underway), some of which I hadn't seen in years.
The crowds were certainly there in July and Sept. I have on only the waist belt worn below the pants belt , right up front, (even though I've been told personally that having the waist belt at all only invites the bad guys to that temptation, ... not interested..., the hidden pocket and that nuisance of a neck pouch,.... no zipped front or side pants pockets. I always carry cash, credit cards, (all 3) and the actual passport on me. The usual perfunctory precautions are enough.