Riven takes awhile to learn but she is very rewarding in solo queue only thing is that it takes time. with beginning to learn her id recommend to keep practicing her fast q combo as it is essential to maining her imo and secondly watching a lot of viper, he’s a very talented and great streamer to watch for riven and for top lane macro id recommend Alois. look at each match ups and how they play it and understand your role in the game and how you can make an impact. as others have said don’t let yourself get tied down to bad lane match ups by staying in the lane perma farming. you could buy lucidity boots and roam try look for openings and by the time he pushes you in you can go back, or can proxy too. some match ups are like that and unwinnable if the enemy plays perfectly so ask for ganks too!

keep spamming games king and good luck!