What do I need to change?

So In the past 3-4 months, I've been doing ranked matches. I do about 3 games on average per day. I can't seem to win any games. I made plat last year as an ADC Main and this season, I cannot get things going. I started g5, made my way up to g2 98 lp and have not been able to get out of G5 since. I'm trying to learn other lanes and choose other roles in ranked but when I take it to the Rift, I can't seem to get a win. I do admit, some games I die a lot and can't get things going, but the games I do well in, my team can't seem to finish the game off and secure the win. I know this is a generic post, but I am struggling really hard and it's taking a toll on me, mentally. I've taken hiatuses for a week sometimes and when I come back refreshed and ready to go, I just get the same result. Any suggestions would really be helpful.