Going over 200mg lamotrigine

I’ve been at 200mg for about 3 months and feeling more stable but still pretty depressed and moody. My psych says I can try 250 or 300mg but idk if it’ll make a difference, and I’m scared of the cognitive effects (I have some word recall issues on this dose already).

But also don’t want to have to switch to another med altogether, or add another one on… does anyone take more than 200mg and find it is worth it?