Should i amend if i haven’t received my tax return after 4/5 months ?

NOOOO ... never amend a return that has not been fully processed.  Wait for the original refund.  Only amend the return if you have something to change and only after the original return has fully processed.

Also, understand that the IRS is woefully backlogged... if you paper filed, assume a good 6 months from filing until they process.