when i first noticed i was hr5. but i hadnt mined for a long time. so it could be hr 4

if your hr 5 and have pokke farm fully developed (at least mining) use large barrel bomb+
in the cave with your cat, mine all the areas, then do a mission with 3 old pickaxes
maximum mega and steel pickaxes then go do a mission in the volcano during the day,mine
all points you should get some easy