I agree with everything already stated here. The (slim) data available from those who chose to "mix and match" boosters show that it's not dangerous, but also, there aren't enough data to show benefit, either.
It's understandable that people are anxious, but the data show that two doses of the Moderna vaccine offer a very high level of protection against COVID, and, in particular, severe or fatal COVID.
IF a Moderna booster becomes available, assuming the criteria for eligibility remain the same, you should qualify. Education staff are listed among those who are in high-risk occupations: https://www.cdc.gov/coronavirus/2019-ncov/vaccines/booster-shot.html#HighRisk
There are mixed messages being put out about this. In the US, the answer has always been we don't know, there's insufficient data, and so stick to the vaccine you got -- but. The but is because other countries have been mixing and matching and not showing any adverse effects. Don't know if they're showing positive effects, though. From what I've heard from a Fauci interview, he expects both Moderna and J&J to get another shot authorized pretty soon.
Everything I’ve read says that the 2 vaccines should not mixed/matched because there has been no safety testing done to make sure it’s safe to combine them. I’ve, also, read that there are higher antibody counts with the Moderna vaccine, even after several months.
I’m fully vaccinated with Moderna, as well. I had my second shot in Feb, so I’m right at 7 months out. I’m feeling pretty safe, at this point but I do carry a mask and whenever I feel it’s warranted, I’ve no qualms about wearing it.