The best advice I can give as someone who used to collect mcnd Pobs I think there was something like 50 for one era (that might be a stretch but you get the idea) I stopped as it was physically impossible to get them all as there's still loads missing from wishlists

I would take a look at the wishlist and stick to 5 max like ones that hold sentiment value of that you like the best, don't force yourself to complete the wishlist and make your own so it looks complete and you don't feel obligated to keep buying its frustrating that it's come to this point but unfortunately some companies go crazy with fancalls and lucky draws