Look, i know this sounds harsh but if you got a 25% winrate in ranked, i think riot should suspend you from ranked. Heres why.
1. Its almost impossible for someone to lose 75% of their overall games unless that person is either Feeding, trolling, or is just not ready for ranked/someone is using their account who isnt as seasoned as them.
2. Its hard to balance a team out with such a low % winrate on one team, ive seen people on my team and the enemy team with sub 20% winrate and obviously whoever has that in their team gets absolutely demolished.
3. that person might just be having a bad day and could be inting, or not playing their best. ranked is a competitive mode where all are encouraged to do their best.
let me know your thoughts.