After doing your usual steps prepping the nail, divide your nail vertically, you can use a pencil, in relation to the finger (not the nail) and see which side is curved more.
Start filing down that side to make it symmetrical and same length.
Then you can move on to the other side and file it slightly. Use a contrast background for more precision.
Apply a bit more gel on the free edge, cure it for 30 seconds in a lamp.
Apply a thin coat of gel on the entire nail.
Next apply a drop dragging it from one side to the other, build an apex.
File underneath the nails that were being fixed, do not touch the sides.
Shape and file to make all nails even.
Once you apply color (choose darker ones), it will look straight.