Let the collection baskets go empty. Don't give them anymore money until: 1) SSPX rescinds their banishment of Bishop Williamson, and offers a public apology to him; and 2) SSPX basically tells Rome there will be no deal until they reject Vat II and abolish the new order mass. Until this is this is done, don't give them another penny. If they are not going to be true shepherds of the Faith, and not listen to the faithful's concerns about a deal with Rome and the unjust treatment of + Williamson, then maybe they'll get the message when the collection baskets come back with nothing but air,,, week after week, month after month.... Also, cancel your auto debits to them.
Now, if you have a particular priest whom you'd like to help, then it's great help him, especially if he's a holy and great priest teaching and defending the Faith (like Archbishop Lefebvre). Likewise with potential candidates for seminaries. If you personally want to help sponsor a man for a seminary, or a woman for the convent, who otherwise would not be accepted due to something like student loan debt, then it is good to personally help them. Just don't give out money that will inevitably end up at Menzingen and go to their projects abroad, including in the U.S. (such as the new seminary).
Also, shift your donations/financial support to the monastery in Brazil (mentioned on another thread), and other such communities of the Faith in other countries.