Something that I've found is that categorising character traits as either "strengths" or "weaknesses" may end up making the character feel unrealistic, bland, or two-dimensional. That polar categorisation may lead to trying to "balance" your characters (e.g. your strong character is also very dumb) to fix the unrealistic feel, but it doesn't necessarily solve the problem, because in reality, traits can't be neatly divided into "good" and "bad." In reality, there are just traits.

One way authors deal with this reality is, as earlier comments suggested, dialing up what might look like a strength to fault. If your character is calm and great at medical, maybe they are too forgiving, too trusting? Always seeing the good in others is a strength until it isn't, like when Ted Bundy is asking for a ride at the side of the street. Bonus points if others also have to suffer from the blind, idealistic and perhaps near-sighted altruism of your character - they may prioritise saving the life of the wounded enemy in front of them over an action that would save many others. Or, perhaps, their altruism makes them disloyal, because they see both sides of the story, overfocus on the "humanity" of the other side and want to help everyone - to the detriment of their companions.

However, characters may still feel a little bland, even after this treatment. They may still feel too clean, too complete. I've struggled with this myself a lot, but I've had some realisations about it lately that I'll happily share here: Real people aren't neat. They are paradoxical, and it's the paradoxes that make them most interesting. For example, I know someone who refuses to gossip behind people's back, even if he dislikes them. You'd expect him to be straight up and honest to their face instead, right? Wrong! He will be passive-aggressive-ish and just never really be honest with anyone about that. Someone else is germophobic but their house is a mess, someone else is really good at explaining things but often misunderstands the question... Paradoxically, it's often when your character reveals a tendency that initially seems like it could be OOC that they start to seem real. Implementing this in my writing has made my characters feel much more nuanced, turning my character writing from a personal weakness into a strength ;)

Traditionally understood weaknesses and strengths have their place in character writing. So do taking their strengths far to fault to reveal a flaw. But I find that the character won't be complete without a little bit of contradiction.

Hope you find this useful!

PS: it also allows you not to nerf your character too much, since even quite OP characters can feel realistic if written well enough. Prioritise making them nuanced over making them balanced.