Your RAM need to be PC3-12800 DDR3 running at 1600 MHz double check.
The beep code is telling us your RAM is not compatible or is defective [https://support.apple.com/en-us/HT202768|About Mac startup tones]
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=== Update (07/25/2019) ===
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At this point I think you need to find someone local to you you can bring your system in to let them look at it. I fear you have damaged your logic board at this point. Hopefully you only have a mis-install of the modules.
Your RAM need to be PC3-12800 DDR3 running at 1600 MHz double check.
The beep code is telling us your RAM is not compatible or is defective [https://support.apple.com/en-us/HT202768|About Mac startup tones]