Awaiting the release on our beloved platform i can recommend you to try the Master SA/SO challenges on both H2016 and HITMAN 2 
It will test your patience and your skills on those games while keeping the thrill of the hardest challenge in the same time 
If you’ve done those already you can also try to browse the Players Contracts (no restrictions about kills) and seek for new challenges like:
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Pick random items in your inventory and go try kill the targets with those…
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Go into the level WITHOUT any item and kill the targets using random map items…
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Get a harder challenge by trying to kill the targets in plain sight and try to complete and escape guards without changing disguise
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You can also try something different by completing ALL targets using Sniper Rifle only
Silent Assassin is recommended but not necessary, as the idea is firstly to have fun 
Cheers and cya around 2022 