sometime, sometimes, some time

Sometime or sometime ( one word ) means one day; at an unspecified future date --
"Come up and see me sometime."
I'd like to go there sometime; it's on my bucket list.

Sometimes or sometimes ( one word ) means now and then, or occasionally --
Sometimes I actually enjoy my job.
He can be very annoying sometimes.

Some time or some time ( two words ) means an unspecified amount or number ( some ) of days, hours, minutes ( time ) --
It will take some time, but he will recover.
If you are willing to spend some time on it, you can do it yourself.

Now that you know that, you can say --
"Sometimes I think about meeting my online friends sometime; I'd like to spend some time with them."