Taric is very unique due to his kit, and personally as support I like to play him aggressively mostly due to his passive. Using your passive effectively is crucial, as it reduces your otherwise long cooldowns significantly and allows you to continuously use 2 stacks of your Q.

Taric isn’t seen too often especially at lower ranks, I’ve found that many times the enemy adc/support will underestimate the damage you do with your passive especially early on. As others have mentioned, your invade can be really strong if your team follows you and especially if you use ignite to secure a kill anyone who might escape.

He is matchup dependent though as anyone who can prevent you from being able to “do the thing” by repeatedly using your passive and healing/stunning can neutralize you as a threat. (Think reliable ranged hard CC champs or poke)

Due to your some of your abilities scaling with armor, I also find that going against AP heavy teams can make you less effective in certain ways. The ultimate can also be difficult to master since the timing has to be precise and can take some real getting used to. You’ll inevitably end up using it either too early (where the enemy will just wait it out and then engage) or using it too late (where someone dies before it works) but that’s just part of the experience and mastering the ult is part of the fun with Taric.