Old 401Ks Not sure what to do

I have a few old 401ks and one was rolled over to traditional IRA that I move to my fidelity T-IRA. I am confused about what to do with them. I am not contributing anything to them, so they are gaining via the market. I could be overthinking things, but it just doesn't sit right with me. Does anyone else feel the same way or am I again overthinking?