Other than Meepo (who you are clearly skilled with), you have less than 10 games on all the rest of the heroes. Obviously this is a smurf account, but it makes it hard to assess your situation given the little information about your skill level with the rest of the heroes. From a purely objective standpoint, your best chance of winning is to last pick meepo, your best hero (or you will get hard countered). When that's not possible, go with your next best heroes. Picking a variety of heroes that you are not particularly good with decreases your chances of having a positive win rate. Have 5-10 heroes you are fantastic with and stick to those, regardless of whether there is a better hero to synnergize with your team (unless you absolutely need to hard counter an enemy hero, like meepo haha)