I’ve recently completed learning full stack development

Have you? Have you really?

Listen I don't want to put down the skills you've developed thus far, but you could spend twenty years working in industry and never finish learning full stack or any other subfield. Maybe what you meant is that you've gotten a lot of the basics down to the degree you feel you can competently execute a full stack project, and that's fair, but I would have hoped along the way you'd have realized how deep the rabbithole goes.

So my recommendation to you is - explore the rabbithole further.

If frontend interests you more, try learning some different frameworks - if you learned React try learning Angular or vice versa, etc. If that seems easy, write some just vanilla javascript with no frameworks and see what all is involved in doing the things frameworks do - hell, a decent project is writing your own (small) framework.

If backend interests you, try exploring other stacks there. If you started off doing something with next or node, try making a backend in .NET instead or vice versa. Or - and this will sound intimidating but is easier than you think - write your own webserver in C or the like so you can deeper explore how webservers work.

Anyways, my guess just from how you've phrased things is that you probably have a fairly shallow understanding of fullstack and probably need to go deeper instead of wider.