K'Sante is a very good toplaner right know. In teamifghts try to tank first, then try to find the carry and ult out of him/her out of the teamfight and try to finish him/her. It's like you're playing tank mordekaiser with high ad dmg.If you want to carry, always by 2nd or 3rd item Titanic Hydra. If you want a more tankier build just build more armor, mr, and health. With your 2 stack q try to pull squishy enemys, and let your teammates finish him/her.Try e your teammates for extended e range + shield. If the enemy have a champ that can hook, pull, stun etc. try to block hooks and stuns with your w, you can save your squishy teammates, and that way you defend the team carry, you can win a teamfight easily.You're your team tank, try to engage first teamfights, dragon or baron fights,if you play it out well, your team gonna win a teamfight + an objective, that's a HUGE advantage to your team. Try to stay calm( I know your playinf LoL that's impossible), and not to give up, cause this champ has a big potential to comeback in the game (like with Titanic Hydra) and carry the game.
I hope you guys found out useful my guide, it's not that much, but I tried my best. Check out other guides and become a K'sante main :D!