Time crystals could be very useful in quantum computing and possibly in fusion, for similar reasons. Essentially time crystals provide a more stable quantum environment then your run-of-the-mill particle beam.
Because time crystals have some self-persistence of their state, even without external input temporarily, they also have extra resilience to all the randomness of heat entropy and external vibrations. This makes them ideal for some designs of qubit RAM.
It should also be theoretically possible to create a time and spatial lattice at high pressures and temperatures, but it is unknown to me what level of technology that's going to require. The resonance stress on the materials would be rather high I think.
Surely other uses exist. One other quantum computing use would be a timer.
Equilibration and order in quantum Floquet matter
R. Moessner & S. L. Sondhi
Observation of a discrete time crystal
J. Zhang, P. W. Hess, A. Kyprianidis, P. Becker, A. Lee, J. Smith, G. Pagano, I.-D. Potirniche, A. C. Potter, A. Vishwanath, N. Y. Yao & C. Monroe
Discrete time crystal in a finite chain of Rydberg atoms without disorder
Chu-hui Fan, D. Rossini, Han-Xiao Zhang, Jin-Hui Wu, M. Artoni, and G. C. La Rocca Phys. Rev. A 101, 013417
Observation of a prethermal discrete time crystal, regarding exploring metastable states in nonequilibrium thermodynamics
A. Kyprianidis, F. Machado, W. Morong, P. Becker, K. S. Collins, D. V. Else, L. Feng, P. W. Hess, C. Nayak, G. Pagano, N. Y. Yao, and C. Monroe