Is setting price targets like this a waste of time? Left holding the bag on a lot of coins after last cycle - and don't want to repeat that this time around

Yesterday I got all my coins (60+) into a spread sheet with the goal of setting price targets today: https://imgur.com/a/aHPdX22

The plan is to set up notifications on each price target for every coin in my portfolio so that by the end of the bull run I'm not left holding any more junk..

However, I am left wondering if this is even worth it... How should I even go about deciding what percent to sell at each price? I'm just guessing and it's giving me anxiety thinking I'm just gonna get left holding on to more junk when the music stops..

Would appreciate any advice.