I think Pochettino should be given another chance after this year because he is currently in the process of getting to know the team. This will last for 1 year and as their adaptation to the team increases, they can achieve greater success with the team. What is needed for Chelsea is time and they must get that time by holding on for another year.
Sure Pochettino should be giving more chance to get more use to the team, perhaps he is yet to understand the concept and patterns that propells Chelsea performance in times of playing, almost every coaches may likely find it difficult or challenging copping or understanding the players as a first timer coming to coach the club so poor performance of the club is actually expected but with time him will set the team on were they are supposed to be, although Pochettino is really under a huge pressure with the low performance of the club and losing matches from small clubs which they are supposed to win.
Mauricio Pochettino isn't a magician rather he's a professional football manager and that's why he needs some time to find the best playing pattern for his club Chelsea.
That being said, the results of Chelsea since the start of the season has been poor especially when considering the number of quality players that was signed to the club in the summer transfer window. Though the club has been hit with injury to some very important members of the squad like the captain Reece James and their striker Christopher Nkunku but I think they still could have done better.