https://reelgood.com -- Good tool to figure out what's on what. You can search individual shows to see what services they're on, or search individual services to find stuff to watch. IMDB and Rotten Tomatoes scores are included. You can also plug in the services you have access to and filter by genre and rating to browse stuff that's available to you.
Succession is available on HBO Max and HBO.
Side note--HBO is disappointing as hell. They launched a $15/mo streaming service that caps out at HD (1080P) with no HDR. So if you want to watch Game of Thrones in 4K with HDR, you have to pony up for Blu-Rays at $30 a season. They're claiming 4K and HDR is "on the roadmap". Resolution makes a big difference--4K and HD are noticeably different--but HDR is an absolute game-changer, especially in the sort of dark and action-heavy scenes that GoT trades in. Just take a look at Netflix's Altered Carbon (shot in 5K resolution) and The Witcher.
And if you subscribe to a streaming service or two, I'd strongly suggest shelling out for a TV with solid HDR performance. $800 will get you into a Sony 55" with Dolby Vision support and full-array LED backlighting.