I have been extremely happy with Unraid. It is by far the most beginner-friendly option and there isn’t an easier solution when it comes to expanding capacity. I run my nzb client and all of my *arr containers on it. My media server is on a used SFF PC I grabbed for cheap — so QuickSync can run on the bare metal. It’s been a great stack for years.
Former attorney who now consults for corporate compliance departments/programs. I have zero formal training or professional practical experience, but tech has always been my strongest hobby. I decided to self host as much as possible almost 20 years ago starting with media libraries and email; it stemmed from a deep distrust of the tech industry.