If your clutch are slipping and it helps to adjust the cable then the cable was not correct adjusted when you started. Maybe the routing is messed up?
When the clutch starts to slip (normally under acceleration in high gears as you describe) you can usually carry on for thousands of km if you avoid the situations where the clutch slips (no hard acceleration and so on). If it slips all the time it will be toast pretty fast.
So if it slips on a trip:
Check cable adjustment, and if it continues to slip get some Coca Cola and wet the clutch with it (panic solution).
If it’s not possible to get a new friction plate where you are then it might be possible for a clutch/brake workshop to make new linings on the one you have.
If you drive to long it’s possible that pressure plates are toast. It also might be smart to change the diaphragm spring.
The reason for your problem might be that your gearbox input splines are dirty or you have a broken output seal in the engine or input seal in the gearbox. But you probably have to change a few clutch parts anyway.
The price for the friction disk should be around 70 Euro and if you are lucky that’s all you need. It takes a few hours so if you can do it by yourself you will save a lot!
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