Hey Belisar! Welcome to the site
I was going to suggest the same thing.
Outside of table time, focus on doing stuff relevant to TT in terms of physical and mental training.
Lots of skipping, ladder drills and explosive power really help one to improve in table tennis. Also a lot of core training is important to keep you strong when twisting side to side ect.
Get a book on psychology in sport. I.e I have read of a book called 'winning ugly' or there is one called 'the inner game'. They are tennis books but relate gratly to table tennis to.These books will give you an insight into how to construct yourself on the table tennis table. When the going gets tough you will be ready!
Also, try to get as much service practice time in as you can.
Hope this helps.