Adding more plans to yousician
Idea is to have more options on available plans. Add more plans, like daily, weekly, weekend, etc. Not everyone can afford price for monthly plan, and nor everyone have enough of time to play for whole paid month. It is better to pay and activate plan with more precise timings, when you now that you will use that paid time efectively for sure.

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Jesse commented
Instead of automatically placing people on a reoccurring payment plan, a pay by the month would be a safer option for those whom are on a tight budget.
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Noah commented
Have it be priced per extra lesson. I would definitely pay .99 cents or 1.99 for an extra lesson a day. But coughing up 20+ bucks to play a month seems ridiculous. I think it's a great concept and I would definitely throw money at it, just not that much at one time. Seems like too big of a commitment and thus not doable. You would make more money with 5,000 people paying one dollar than 10 people paying 20 bucks.