I think the first thing is look through the last 3-6 months of posts from the 10 or so kids/toy channels active on here. There's a wealth of information of what works and what doesn't in our vertical. Then the next most important thing is to decide if this is a hobby or a serious business. Based on that, you have to decide on doing videos you may enjoy/like more (for example toy unboxing, playing, non-scripted), or focus on getting on trends, which will require identifying a few channels in the 5-20k sub range making vids on trend and growing quickly in the last few months, carefully analyzing their methodology and implementing a shadowing strategy.
As a general observation, skits are in you are correct, and pure-play toy unboxings are out (for the most part). During this year there has been a serious uptick in quality (lighting, videography, storylines), mostly coming out of Russia, led by Vlad Crazyshow and a few others. There have also been a few strong growth channels in the 'learn colors' space, once again many out of Russia, some out of Europe.
Coming back to your question, if you do this as a business and want to grow, you will likely need to execute a skit strategy, focussing on great videography, snappy, unusual storylines and fantastic thumbnails. The more wacky the better. You will also lose most of your hair. If you want to do it as a hobby and relax more and have fun and not stress (but max out your Visa card), toy unboxings and playing type videos are the go. Of course there have been a few massive playground hits, generally combined with nursery rhyme songs, and those don't cost much apart from some gas, a packed lunch, and a custom song from fiverr.