Few hours ago I had a short discussion via email with the principal that boils down to "we don't really want you to do any more lessons" with some of the least supported by evidence reasons I've seen this side of "we need to make more ice cubes to combat global warming". You were donating your time to the school, and the principal wasn't professional enough to have a straight conversation with you? I'd venture the reasons aren't terribly important, because office politics are inane at the best of times. The real question is, I actually feel really, really, good in a role of lecturer. do you want to find another outlet for that?
If the true reasoning was some flaw in your performance as a lecturer, I think the absolute worst thing you could do is to give it a rest. If there are flaws you need to find a way to do it again in some form, record yourself, and find out exactly what you need to improve on.I'll likely give it a rest until the next semester.
Well I'm not trying to give you a motivational speech here, but any sort of public speaking or performance in front of a crowd is pretty complicated and a difficult thing to master. I'm just saying that you clearly love speaking about these subjects that you love to study, and if one failure-- one which you still have not gotten a clear explanation for-- is going to make you take a break, then it seems like you're betraying your commitments to these things. I played piano for 12 years and ended up playing at some really big stages more than once. After a shitty, shitty performance I wanted nothing more than to have nothing to do with the piano for a while, but my mom made me watch the recordings which I fucking hated doing. I ended up glad that I had these recordings to be able to proactively assess my performance instead of wallowing in the failure. Not trying to push you in any way, just pointing out that you're doing something really really cool, which makes me pretty jealous as someone who loves physics but is mediocre at it, and you may be taking a setback a little too harshly here.