Has anyone successfully switched from lithium to lamotrigine?

I'm currently on lithium, abilify, vraylar and haldol when it gets bad. I hope I'll be able to taper off vraylar soon. I've been on lithium for 4 years and it works wonders: I've been hypomanic and had mild delusions at my worst, I'm the most stable I've ever been (I only had one psych ward stay since my last proper manic/psychotic episode in 2022). I'm having issues with weight gain and my thyroid levels are fucked though. In the past I asked my psychiatrist if I could switch to lamotrigine but he didn't prescribe it to me because he said it's more of an antidepressant and isn't as effective in those with a history of mania. Can a higher dose be more effective in preventing mania? Has anyone switched without having issues?