The Global Millimetre VLBI Array (GMVA) represents the most extensive array for high-resolution observations at 3.5 mm wavelengths. The mm-VLBI technique has reached a state of maturity and is now delivering cutting-edge results (e.g., the combined image of the black hole shadow and the jet in Messier 87 published by Lu et al. in April 2023). A leap forward is planned with upcoming advancements, including multi-band receivers which will allow the frequency-phase transfer technique to be used, mitigating atmospheric phase fluctuations and improving image fidelity by one order of magnitude in terms of signal-to-noise ratio in the observations. A new generation of digital baseband converters yields a big increase the data bit rate, allowing for more efficient data processing and higher quality observations. Furthermore, the expansion of the network with new telescopes, such as the phased ALMA and the forthcoming APEX, is continuously enhancing the Fourier sampling and therefore the resulting image fidelity. These technological advancements and network expansions will significantly boost the GMVA's observational power, paving the way for new discoveries in millimetre-wave astronomy over the next years, connecting the European VLBI Network and global cm-wavelength down to 7mm with the Event Horizon Telescope observations at shorter wavelengths.