OK, let's start off with your first mistake which is BPM. This song is not 140BPM, but rather 210 (or 105) BPM with the offset of 85.
Second, seems like you know how to modifying sliders through .osu file, and you're abusing it. Please only do that under specific circumstances, other than that just move your point on the slider to change the shape and length.
Third, you have lots of unsnapped objects.
Fourth, your map is pretty messy with the lack of patterns and aesthetic.
Fifth, YouTube is not suitable for Source field. Only use that when it's from anime, film or game, otherwise leave it blank
etc.
To summarize, your map needs lot of improvement. Either remap it or move on and map something else.