dont understand the question so i will answer from as many angles as i can.
being level 25 is just a stepping stone. it caps at 30 but seriously being under 30 should be viewed as learning the basics phase. its not really suppose to be a accomplishment hitting 30 just a moment when you can atleast say you have played the game enough to know how it feels.
playing other champions is fun
https://www.youtube.com/watch?v=dlcvfhXnEm4
you should try and get a variety of experience with them.
once you hit PvP just dont get caught up in chat too much. People who talk and argue will stay low elo because they spend more time arguing so basically take chat with a grain of salt. This game, in ranked, puts a large amount of stress on people and people are unaware of the effects of being that competitive.
as far as should you keep playing. you are balancing time verses enjoyment. if you like it play it. if you dont dont. if you have time or not. balance your life accordingly with what you like and not.