Have you seen this thread.
good info on the 215, some pics on the last page too of what to remove and what to plug.
https://www.arboristsite.com/community/threads/ms180-adjustable-carb.74899/page-12
Edited to add.
When you took the carb apart, did you remove the main jet and ensure it was not blocked, it sounds like main jet starving issue.
Take cover off carb again, and remove the main jet, flat head screwdriver, then check to see if its blocked, its very fine drilling hole, so dont go shoving a needle or wire brush thru it. Some carb cleaner and air should suffice if its blocked.
Be careful with the rest of the main jet passages in the carb, as there is also a one way valve in the venturi of the carb that can be damaged with compressed air.
Gentle application of air to check if its flowing, even just a hose and blowing thru the hose to make sure its not stuck closed, carb cleaner can also affect/ damage the valve there too.
Also
Is the fine mesh screen thats before the needle and seat clear ?
If thats all ok, could check the fuel hose, is it sucking closed due to the filter being a bit blocked ? you should be able to blow thru the filter easily, any resistance and its time to replace it.
hope that helps.