Really wild that there's "cutting" in D3, but maybe that's because my school let everyone run, and the only cutting involved who was in top 7 for the varsity race and, therefore, who made the cut to race at regionals and nationals. But aside from that, everyone was around all the time.
Having said that, talk to the coach about what it would take not to get cut, as others have said. Then, put in the work, and see what happens. If you DON'T make the team (and I understand what a bummer that would be, because my daughter faces the same issue with soccer each year), then keep training and find other ways to keep active with groups. Not being on the team doesn't mean you can't hang out with the other runners (though obviously that won't have the same feel to it, since they'll all be doing what you want to do), but it also means you can do some chill intramurals, club sports, whatever. Some of the most fun I had was playing intramural sports a couple winters when I wasn't running indoor track.
Finally, although it would be a major move, if being on a team is really that important to you, there's always switching schools. Not a move to be made lightly, but that's always on the table (obviously need to get some significant sign on from anyone who's paying the tuition bills). FWIW, I have not given my kid this advice, but I've thought about it in my head.
Try to make lemonade from any lemons you are served, and good luck.