The thing is, Roddenberry wrote a sequel series set in the distant future, however Paramount rejected it out of hand as it involved the Federation being destroyed.
So it was turned into Gene Roddenberry's Andromeda by a different network after his death and they did a find and replace on the names. The Federation became the Systems Commonwealth, Nietzscheans were the Klingons, Vulcan became Tarn Vedra, so on and so forth. It wasn't a bad series per se, especially for the early 00s, despite the terribad acting (and I'm not just talking about Kevin Sorbo) the show runners managed to keep it interesting, worth a watch if you can get past the kitch. Maybe enjoy with a few beers.
Earth: Final Conflict was another of Roddenberry's shows produced after his death but unrelated to Star Trek. Same problems with bad acting that plagued 90s SciFi but it was still a good series (I find the Donald Trump character (Jonathan Doors) particularly hilarious now).
In all cases, I think the fan base is the worst enemy. No franchise like Star Trek is ever going to measure up to the mythology of the older series. TOS really has entered the realm of cultural myth, and TNG, though everyone forgets how much the first season was disliked (and on rewatch a few years ago, I have to say it feels like a wonder that it ever got a season 2), isn't far behind. Even DS9's critics have finally stopped talking, and for my money, it is the most consistently well-written and well-acted of all the Star Treks. But that kind of legacy is absolutely toxic, because if you try to be too different everyone screams "It isn't Star Trek", and if you try to be similar in tone, then everyone complains "We've seen it all before!"
I did a complete rewatch of TNG, DS9 and VOY a few years back and it was a surprise to remember that none of the series really found their feet for the first 2-3 seasons. DS9 didn't become the DS9 we all remember until there were some serious changes with Season 3 (I.E. the introduction of the Dominion, Michael Dorn joining).
As for Trek, we've still got the Orville. It's green lit for S4 but Seth Macfarlane is busy.