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It's not that FL is limited (of course it depends on which version you have), but did you already check out the offerings at https://www.afreestudio.com/ ? Spitfire Labs has some really nice stuff that's not mainstream, Native Instruments has lots of nice free stuff. https://vital.audio/ and https://surge-synthesizer.github.io/ are amazing and have tons of sounds - not necessarily mainstream.
The other part is of course heavy sidechain compression and in some cases a subtle tape/VHS effect to give things a bit of warp. Trust me when I say that free software synths can absolutely do this, and if you want the hardware versions of these you're probably looking at four figures. If you'd get a Minilogue or something, you wouldn't have drums, and you'd have to record several parts on top of each other several times in order to get all your instruments. This is fine but it is tedious.