Zoloft 100mg and insomnia

hello, I'm on Zoloft 100mg for 3 months now, while it made an improvement for my mental health, unfortunately the insomnia persists , dr added Remeron 15mg and it helped a little with the sleep but reversed the positive outcome from Zoloft and made the depression worse so I stopped it, P.S I'm also a heavy vaper. so what helps with the insomnia without interfering with Zoloft effects?