Plenty has been said already, so I'll just add a couple thoughts.

Hike in established, well-traveled areas while you get your solo legs under you. Better to be in an area frequented by others to not only calm the inevitable jitters but get ready assistance should you need it (including simple trail instructions).

Consider toting a SPOT or InReach device to communicate with somebody back home, and allow you to SOS should you truly get into trouble. (With some exceptions, cellphones generally don't connect in the backcountry.)

If I didn't solo I would seldom hike, so I've adjusted to the whole idea of being the only person around; in fact, I kind of like it that way. Having a family means having the responsibility to make it back home, so I do what I need to assure that will happen.

Cheers,