We give to our not-yet-frum and elderly neighbors ONLY!
If I happen to be speaking to frum, young neighbors/friends before Purim, I make sure to mention that we won’t be giving them (by now, most know), so no one feels left out.
This way, we can make the few(?) that we do give nicer than if we were giving 100 mishloach manos.
We try to add a new person every year- a non-frum neighbor we don’t know that well, usually.
There were small things that people did for my husband before he became frum- e.g. gave up a seat in a crowded shul on Yom Kippur, which made a roshem on him.
As for teachers: give ’em gelt! Their meager salaries don’t pay the bills, but if every kid gives $10 (or more!), that’s a piece of an overdue paycheck.