  We propose new 3d $\mathcal{N}=2$ Seiberg-like dualities by considering
various monopole superpotential deformations on 3d $\mathcal{N}=2$ $U(N_c)$
SQCDs with fundamental and adjoint matter fields. We provide nontrivial
evidence of these new dualities by comparing the superconformal indices, from
which we analyze the change of the moduli space due to the monopole
deformation. In addition, we perform the $F$-maximization to check the
relevance of the monopole deformation for some examples, one of which is found
to exhibit nontrivial symmetry enhancement in the IR. We prove such enhancement
of the global symmetry using the superconformal index.
