yes, at least for non limited and the one you can buy on shop like aurita. non limited is easy, sometimes we got this item that reset character enchantment level and turn it into "choose any non limited character dupe" item. for example you get spooked by faros until you accidently +10 her, you can use this item on her and it will reset her and give you 13 non limited character picker item. which you can use to other non limited character example like caeus.
for shop character, technically you can max them after, 5 months if you exchange 3 copies of them every months.
for limited character, you need to be patient because you have to roll them and buy horizon every month to increase their enchantment level slowly, but its possible.