We have used Adventures in Creative Writing over the summer which is in person. Writing camps tend to be super expensive in person and short lived, but they are totally worth it. The problem is during the school year, there is not enough time nor enough options and now my kids are too old for most writing camps. We have been using Outschool ($20 off here --
https://outschool.com/?signup=true&usid=KiBvNMdV&utm_campaign=share_invite_link) and some of the classes are as cheap as $5 per class and they are good. The best part is that they are relaxing so our daughter (who struggles in 9th grade english, especially this year) can have a tutor (for super cheap) to talk about basic errors and common mistakes as well as to then ask for individual help when teachers are unreachable.