Hey guys is there's any new weapons other than black Smith
Like a legendary weapon in some place in the map or obtained by quest and is there is any way to get stronger other than potions and leveling because Iam not getting much stronger
The blacksmith in the Greyport Inner City sells improved weapons...not massively more powerful, but still better. You can also acquire the Photon Sword in the Ancient R&D center (unlock that area during "Ancient Technology"). Other than that, no.
Normally potions & levelling is it, but there's a built-in cheatmode. Near the spider caves is a body with a key, it unlocks the outhouse/shed next to the guard tower. Inside is a shelf with an item that makes you
almost invincible if you equip it. If that isn't enough I don't know what to tell you.

(There are also some chests with cash and potions that refill daily, some are empty until certain quests are completed.)