Tips on team fights and late game riven

I’m still new to her but after some practice I seem to know to hundred most of the landing phase and win or go even but after that I just don’t know what to do. I always try to roam but in team fights I get focused every time and when I flash on the enemy arc I’m just not fast enough to delete it. I probably need to practice the fast combo more cause I’m relatively slow at attacking... but could you give any tips on how I should behave at lategame?
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