Alright so Illuvium overworld have a big issue of supply and demand, as you may see prices are going down daily, and they wont stop.
The solution to that and to bring everyone and more players to comeback is:
1 - Make all stages with no costs.
2 - Make all illuviais from T1 to T5 in a way that is very rare to find.
3 - Make all resources from all stages being T0, while you can find a few resources that are from T1 - T5.
(And continue lowering supply as more illuvials are found).
What this will bring?
1 - Everyone will come back to play, including free to play players, and people that invest.
2 - Illuvials will start to raise in price, because they are so rare to find on all stages, that people will actually need them to beat stage 3.
3 - Materials will be very hard to find also, making it hard to craft the shards, in order to get one rare illuvial.
4 - Even having all stages cost 0, every investor will be happy, because the illuvials that they have will be insanely difficult to find.
Its all about supply and demand.
Free to play players will have the drive to start to build up and search for the ultra rare materials and illuvials.
Investors will have a strong community to negotiate with.
I hope this idea is well accepted and that people on the top change those for the longevity of the game.
Att. Goodvibe.