You cannot pay for an experience that rivals Plex (or in this case Jellyfin).
It's not about being cheaper, that ship sailed for me a long time ago, I've easily spent over $10K on hardware alone over the years but being in total control of your media is amazing. Want to share a clip? Just cut it and share it. Want to watch media on any device online or offline? No problem. Want to share with friends/family? Easy.
I buy all my audiobooks on Audible but I rip the DRM off them, put them in Plex, and then listen to them through Prologue (amazing iOS audiobook app) because it gives me full control.
I know this method is not for everyone (it does require a non-zero amount of technical knowledge, though I have set up systems for others that have worked with nearly no issues for years) but it's by far the best watching experience. No ads ever, instant playback, 1 UI/UX to learn, never asking "What service was that show on?", etc.
If there was 1 streaming service that had literally everything and I could pay $300+/mo or so for then I'd probably jump at the chance. Instead you have to piecemeal together a slew of services that all have different UIs/paradigms and they remove/shift around content. I had high hopes for Amazon's "Channels" and Apple TV (The app, not the device, not the service, come on Apple....) but neither really got all the way there for me. I'd even pay each individual company if they gave me (aka Plex) an API to suck down the content without using their apps/websites.