Am I allowed to add my hadasim (myrtle) to a bouquet after yom tov?
Or do anything with any of the arba minim after yom tov?
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Yes. There is a nice idea which is to use the object used for a mitzva for another one, e.g., I have seen
Beyond this you can also
The only halachot I know of is not dispose of the four species in a degrading way, e.g., OU writes (bottom of here)
You may dispose of a lulav in any way that is not degrading. So, you may drop it into a field or put it on a lawn–unless animals might eat it or step on it or if it will be subject to poor treatment before it decays. Don’t dispose of a lulav or etrog directly into the garbage. Burn, bury, or wrap them in a bag or one layer of plastic and you may throw it into normal garbage.
(see also here)