In general I would say keep small amounts on there. I wouldn't walk around the street with 150k in my pocket, and I would treat ln the same.

Dont host in the cloud, always update as soon as patches are released, only connect with peers that are reputable

And don't be too emotionally attached to lightning, it's not clear that it's a winning idea. It has many problems and mostly only works well with custodians or very technical users.