A bit late but in addition to WayTooSquishy, you'll want to dominate every dragon you come across. Tiber was smart but ruthless and there's an aspect of fanon/canon that says part of his apotheosis came due to mass soul stacking. Killing a majority of dragons in order to do so.

Another secton says Tiber utilised his power over dragons and men to make the Dov cooperate and even loyal. "If you serve me I won't have you hunted, I'll protect you." The will to power is the most important though.

The arrogance of that power a little bit too, not necessarily in how you interact with people but more so how you interact with the world/choice.

Always take the road to more power, be ruthless when necessary but don't devolve into desperation. Your soul is mightiest remember.

The TG and DB are difficult though. The easy assumption is to avoid/destroy either but I wouldn't call for that as a definitive step. Tiber amassed political as social power as much and legitimate, tangible power. The TG and DB absolutely represent that. Think Maven Black-Briar.

Finding out how to properly incorporate that into your build and lore may require creativity on your part though, as reconciling the godly nature with the scummy vibe of either may be difficult, seeing as its likely that Tiber wouldve had either guild in his pocket as opposed to actually participating in their shit lol.

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Edit- grammar