how win singularity T5-7? please help somebody
You unlock T5 a lot earlier than you get the ability to clear it. You have to consider the things you can still use to make yourself stronger. Namely, infinity points, equipment, and the passive enemy-weakening effect ascension shards grant you (thanks to the Ascension Affect, which is part of Rebirth).
You will want to unlock the strengthened equipment from Dimension 8 and the radically reduced stage scaling from Dimension 3 (which can be completed back-to-back to radically reduce tiers 2-10 ) to allow yourself easy ascension shard farming. You'll want about 2.5k Infinity points, too.
Basically, you want to complete everything prior to Dimension 9 other than Dimension 1, which you should be close to completing anyway.
Once you've beaten T5, you're already ready to beat T6.