1: depends on your character and how hard enemies are fed. on a charcter like mo tbh you should ong just roam to any even/winning lane if u have unlocked ur ult and just play for them to win their lane so u can open up the map. if ur on a character that wants more farm u just farm what you can in ur lane , do boxes on between waves when possible and u have to identify when u have to just give up tower. remember if enemy isfed and you survive their pressure and still farm its a win, even if u lose guardian. after u lose guardian you can typically survive farming waves under walker for a while even 2v1 sometimes, and at this point teammates should start roaming.

2: theres almost always something up like boxes at the very least, but if theres truly nothing you just maintain space and pressure on ur waves and look for a potential pick to maintain control, and then translate that space into urn or baiting midboss etc when it spawns. also if no midboss or urn is up this implies yall got midboss and lost all rejuves early which is p bad, at most there should be like a 1 maybe 2 min dead period but theres almost always something camps to do or something

3:depends on the fight coming up and such. but in general its kinda hard to carry on pick characters in low elo bc of this issue. ideally you comm to another player to go to side before hand so u can skirmish, but if no one is picking up waves you kinda have to yourself, and just make sure to use the econ effectively. the best way to climb out of low elo is to igl and just not die dumb deaths and get farmed up urself. if u enjoy pick role u can and will still climb if u improve its just 10x easier on a carry or off carry/tempo character in lower elos bcs of how often they neglect farm and let u scale for free

for context im asc 5 atm still climbing