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At the apex of its success, after the Higgs boson discovery, high energy particle physics has little guidance on how to best invest for its future. Nonetheless important decisions must be made in relatively short timescale to secure a continuation of this field of research after the end of the Large Hadron Collider high luminosity experiments. After discussing the physics motivations and technology issues that can provide indications for the choice of a major future research facility, we describe the ongoing activities currently supported by INFN/CSN1 to prepare a future for particle physics after HL-LHC.