1. If you place many different markers on the map (button “space”)
then in the game itself, they will be displayed in the corners of the screen. :
In Gameplay Settings - There is no button to disable these markers!
Because if you turn off all these hints, the markers will still be displayed 
Conclusion: add a button to DISABLE THE DISPLAY OF MARKERS ON THE SCREEN
“Show marker on screen” - On/Off
2. The markers remained the same as before.
You need more than just a pickaxe in this game. It could be a fishing rod, an axe..
From the terrain where the marker is located, you can try to figure out what is needed. But this is not always the case, especially if it is an adjacent surface.
I suggest adding more markers and more colors. Where, for example, is the yellow color? You could increase the number of markers instead of making everything universal.