Whichever manual it is to which you refer should give you some appropriate guidance.
If there is no other guidance run the calcs again either
(a) for incremental increases in TOW until you get a speed schedule for which V1 is not less than Vmcg. For a ferry flight situation off a normal length runway, this will fix the problem very quickly. If you have room to spare, and there is no contrary AFM caveat, consider increasing the weight to increase the schedule further if you expect to have a crosswind.
(b) for incremental overspeed schedules until likewise
or
(c) if your runway is really short, use another one, or wait for a better wind, or offload some weight (in the hope that you might be able to achieve a suitable overspeed schedule at the lower weight