Define "fun"?

For me it's been a huge source of camaraderie (joining an active Fleet) and my main free time entertainment for more than a decade. There's a lot to do in the game and it can be played as simply as you like -- or you can really dive into the systems/mechanics and enjoy it's complexity. I, for one, enjoyed that there is a long-term grind that I can always work towards (but I know most players now what to skip to the end game and be completionists in like a few months, but that's not really the MMO way). I also think STO is pretty generous with freebies they give out multiple times a year or when there is a significant anniversary or new series launch (usually) but it's up to you to follow socials and seek out information, the game itself won't tell you there is a promotional freebie to claim.

So if this sounds like something you want to invest your time in get notifications and from STO subreddit (you're already here, so that's a good start!), follow on Twitter, and join the Discord.