I wants some tips from people who use multiple finger

So I recently started playing pjsk about 1 month ago and used thumbs cause they were more comfortable for me. But I tend to struggle on level 27 songs because some song requires e to reach further than where my thumb can reach. So I was wonder if there are any tips to get better at using multiple fingers? I play on a phone and I tried multiple finger but it make it harder for me to see the notes.