Are you looking for a synth which is free and can make any type of genre?
Well Vital has you covered! It's a synth which has all the basics for making sounds and compares closely to synths like Serum!
There are four buttons on the top of the synth which are: voice, effects, matrix and advanced.
Automating parts in the synth compare close to how Serum does automation. If you are starting out in sound design, I would recommend picking this up!
You can install third party banks if you want more! There are paid options which let you have more sounds, banks and the companies benefits.