My license is 3/3/2/4/4 (android phone)
But when trade and mining license reached lv4, xp is 0 and
It doesn't increase anymore no matter what I do(mission, mining, trade...)

Anyone know why and how can I solve this?

Yes, you need a full subscription to advance past level 4. F2P and lite players are capped at level 4.

Oh. Thx for comment!