Chelsea actually always tries to apply that it's just that the way they do it is too extreme every season which makes it even more difficult and hassle because of adaptation with new players every season that occurs.
The season has not yet ended, and if Chelsea can continue to perform well they will have a chance to qualify for the Europa League. However, for the time being, it will be extremely difficult for them because Tottenham and Manchester United are the favorites to qualify for the Europa League, but if they mistakenly lose two or three games and Chelsea does not lose a point, they will have a chance to qualify. Chelsea did not have the opportunity to play in the Champions League or Europa League last season, and they are playing as if they will not have the opportunity to qualify this season.
Indeed, in terms of math now Chelsea have 39 points and have a gap of 14 points from Tottenham who are in 5th place, which is the Champions League zone.
This means that in the remaining 11 weeks for Chelsea they must be able to win at least 5 times and Tottenham and other clubs above Chelsea must lose approximately 5 times to be able to make Chelaea in the Europa League zone. although winning 5 more matches for Chelsea is still possible but we must be logical because it is difficult to expect other clubs to lose because indeed the problem is to qualify for the Europa League Chelsea must hope for other clubs and it is an unfortunate situation in the rest of the season that is happening right now with Chelsea who still have to face big clubs and several dark horse clubs in the rest of the season.