  In this work, we derive lower mass bounds on the Z' gauge boson based on the
dilepton data from LHC with 13 TeV of center-of-mass energy, and forecast the
sensitivity of the High-Luminosity-LHC with $L=3000 fb^{-1}$, the High-Energy
LHC with $\sqrt{s}=27$ TeV, and also at the Future Circular Collider with
$\sqrt{s}=100$ TeV. We take into account the presence of exotic and invisible
decays of the Z' gauge boson to find a more conservative and robust limit,
different from previous studies. We investigate the impact of these new decays
channels for several benchmark models in the scope of two different 3-3-1
models. We found that in the most constraining cases, LHC with $139fb^{-1}$ can
impose $m_{Z^{\prime}}>4$ TeV. Moreover, we forecast HL-LHC, HE-LHC, and FCC
bounds that yield $m_{Z^{\prime}}>5.8$ TeV, $m_{Z^{\prime}}>9.9$ TeV, and
$m_{Z^{\prime}}> 27$ TeV, respectively. Lastly, put our findings into
perspective with dark matter searches to show the region of parameter space
where a dark matter candidate with the right relic density is possible.
