TikTok & IG - Q for ppl who are growing both accounts

I’ve primarily been trying to grow my TikTok but I’ve been thinking I should repurpose the content and just repost on IG in the event that it does well there because that wouldn’t hurt. For ppl who are or have successfully grown both accounts side by side, did you create a new IG and keep your personal IG separate or combine them? I’m not sure if I should combine. My TikTok is around travel atm (it could evolve and add other stuff once I have a bigger following). Any thoughts?