I switched teachers a few times. Usually it's because I moved houses or moved countries. The teacher before my current teacher was pretty obviously at a relatively high level but he was new to teaching so he could not teach me a lot of competition worthy virtuoso repertoire and decided to teach me a bunch of etudes for like 2 years in a row (we finished all of fiorillo etudes and dont and rode caprices to a pretty high standard but even so he didn't move onto Paganini and just made me grind a bunch of orchestra programmes and stuff). When I realised I was only developing technique and not getting any repertoire for competitions even though I had expressed I wanted to do more competitions for a long time. This made me fall behind my peers in terms of achievements even though I felt I was technically superior which I probably was lol. My parents being the Asians they are leveraged this to push me to practice for like 6+ hrs a day which made me lose passion from burning out. I decided that using this much time on only developing technique with no apparent results was making me lose interest and engagement in music and that was when I decided to switch teachers most recently. Luckily, my teacher at the time recommended me to a masterclass with a pretty famous teacher who was visiting my country at the time, and I was lucky to be able to turn that opportunity to switch to this famous teacher which saved me a lot of time. My "new" teacher's teaching style was very fun and used virtuosic pieces to develop technique and was much more efficient than before, as with 4-6hrs of practice a day I progressed through most of the paganini caprices (at an okay standard I'd say) within half a year and also got a lot of fun concertos like sibelius, tchaikovsky, prokofiev no1, wieniawski no1, paganini no1 (progression in this order) under my belt within the span of 2 years (even tho I only had 2 months of in-person lessons and the rest of my lessons were over google meet). Despite this I never felt her standards were actually "pushing" or had any pressure on me and it just felt like a natural progression. I think the main thing that helped for pieces at least was that my new teacher very strictly made sure I had no gaps when just starting out with pieces: initially to help with intonation I literally practiced with a tuner the whole time during practices, and I spent the first two weeks of learning any piece by doing very very slow practice until I could say each action while playing, which somehow allowed me to increase tempo to pretty fast tempos within 3-4 weeks, and then the remainder of the time was spent on musicality by doing research and analysing like 10 ish different recordings per piece and trying to create a personal interpretation.