[creamburmese]

In response to the OP - for something specific to try - if you can identify the phrases in the pieces:

- first have each phrase start quiet, build to get louder towards the middle of the phrase then get quieter again to the end

- "wind down' a little in tempo at the end of phrases, maybe even adding a short pause before the next phrase

And singing the melody can often clue you in to other specific variations in tempo or dynamics that would sound good...

Best of luck!