Pay attention to your midi plugin section in abletonlive,
insert the "velocity" plugin in your miditrack , push "drive" and "comp" parameters a bit! maybe a bit of "random" too why not? and check the results

"Drive" and "Comp." can give you the extra punch or expression to melodies, you can give this a try before going for transient compressor or adding other effects, this might give u the extra attack and punch you needed.
The Random section can make your melodies wider (specially if, per example, theres pan modulation linked to velocity in your synth), or it can also make your drum tracks feel a bit more "human" , pretty cool in closed hats, rides, etc
pretty handy guy to insert in all your midi tracks. Can be a both a time saver or a quick way the get a bit MOre out of your synth!
I havent found a midi velocity plugin has good has this in scope or vst, but i confess i havent rly looked much since this is one of my gotos

(Ican make a video if you want!)