When & where can I find a suitable job? I am in 50s. Can you advise me some fruitful source?

I have almost 25 years of field experience. I have 17 yrs. at sea & having vast knowledge in ship repair activities, running & maintenance of main diesel engines, generators, gas-turbine generators, all types of central A/Cs, maintenance & installation of split/window A/Cs,freezers & chiller containers(10 feet to 40 feet), 5 star hotels as chief engineer, land based industries,all equipments related to shipping & hotel industries,noise & vibration condition monitoring,knowledge in civil engineering, plumbing, carpentry etc.compressors of various types having moisture indicatio systems etc. etc. many more equipments. Presently serving as a manager maintenance/Chief engineer in a MNC.