Sounds like you're on the right track with your stealthy character! The stealth elements in Oblivion are widely believed to be some of its best asepcts. I would say yes, absolutely join the Dark Brotherhood and complete that questline. In my opinion, that's the best part of the game, followed closely by the Thieves Guild questline.
Next, I would say start picking up some various magics to supplement your skills. Conjuration is a great skill that goes hand-in-hand with ranged combat, and so is Illusion. Plus, both of these skills are extremely easy and fast to train, and they are a good introduction to creating a more magic-focused character, which I highly recommend that you do if and when you decide to retire your archer.
Then there's Alchemy, which is probably the best skill in the game, and which you should absolutely be using if you're an archer. A hidden upside to mastering Alchemy is that it automatically puts you off wandering the countryside in search of various ingredients, which will give you all kinds of new encounters and experiences.
Overall, I would say that ranged stealth/magic is probably the most powerful path you can take with your character. The combination of sneak attack bonuses, poisons and various types of damaging magics all inflicted from afar, makes your character extremely deadly and exceptionally hard to kill. However, I would actually say that melee stealth/magic (a nightblade, essentially) is probably the most fun you can have with a character. You really have to get creative and plan ahead for every encounter when you don't have distance as an advantage. That's my highest recommendation.
Also, most mods work exactly the same on the Steam version, as do mod utilities like OBMM and OBSE. So mod to your heart's content! :)
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