Personally, I have never leveled anything but 4* troops. I knew from the get-go they’d be the most versatile - thereby the most important - so I stuck to only leveling one of each unique 4* in each color. With the introduction of ninja troops, that makes three levelled troops per color
- Take one of each ninja, mana and crit to level 23 (most/all are @ 22, either waiting on feeders, or waiting on a ninja troop - as I’m only missing red and purple ninja)
- After, I plan on leveling two more mana: one to 17, and one to 11; they will get all of my 1* and 2* feeders (upon the rest reaching 23) and my 23’s will get all 3* and 4*.
After that, I’ll have five levelled 4* troops per color - for mono.
If you don’t use mono, or rarely use it, you could probably cut your 4* leveling short. Really depends on your priorities and play-style.
As far as 2* and 3* go
Unless you’re aiming for Top 1000 [rare]/500 [epic] (or higher) [in events] and find you can’t make it, or struggle to obtain Top 1%/5% in most 3*/4* tournies, then I say leave em for now…
…that, or wait til 4* become just too expensive to feed anything but 3* feeders to. & Without any other 4* plans in mind, may as well.
Idk, personally, I don’t think leveling 2* or 3* troops are all that important - despite seeing teams on leaderboards always sporting em - as I find I’m able to land in an acceptable place [for me] just fine [without em]. But then again, I’m also the chick who doesn’t use 4* mats or emblems soooo… What do I know?! My advice and play-style may, very well, not suite everyone
So what I’m trying to say is: go with your gut. If you feel you need/want to improve in an area, and think leveling troops could be the answer, then take it - as you’ll know best. Troops will always be relevant, so at the very least, your hard-work will always pay off somewhere