Where can I find free sources to practice shadowing? I went to Japan somewhat recently and found that I can understand far more than I can speak, and often stumble over my words. I can’t seem to find good shadowing on YouTube but know that sometimes it’s just due to not knowing what to look up.
If you just started shadowing, there is a really good option close to you:
Activate that setting first and just repeat each word while doing your daily (when there is some audio). At the level of difficulty, there are channel like: Taka Nihongo Dojo
You probably can find other like a few like that (I just don't remember the names) and youtube-kun will recommend them at some point (probably).
Those are good for words in isolation and it's nice to be subscribed to a few of them. But honnestly, for that part renshuu can already quite a lot.
For sentences, I guess channel like もしもしゆうすけ are the best if you want to dedicated some specific time for shadowing. There are EN and JP subtitles, so you will not be disturbed if you don't know a word and it's a channel made to help people learn japanese.
If you don't want to dedicate some specific time, search for what you like. Find a word on renshuu or wikipedia, search it youtube and subscribe to few, watch a few video and... youtube will just feed you new channels. I recommend that. It's worth it to search for channel that you like yourself. Because the channel that I shared are "educational" channel (and renshuu is an educational app). The pronunciation is a bit too much "ideal". Also, it's not that fun too. While non-educational channels are quite... wild but also more fun. It's a "fun vs easy" trade off. So, well, up to you. But if you're stubborn go for the fun road.
I probably have more channels in a corner of my head but if you don't tell your interests, I won't remember them. Also Shorts in the morning with a coffee in your bed is the best (for shadowing, immersion, etc) Just subscribed to everything you like and enjoy youtube-kun giving some warm up exercises each day