I think I've milked all I can out of my Hustler vertical on 20m, 15m and 10m. Especially 20m where I haven't heard a single Alaskan station. And on 10m the antenna seems to deaf to AR, TN, NC & SC. I've assemble a rigid dipole for 10m which I haven't put up yet. If it works and I get the last 4 states, then I'll extend it for 20m to work AK.
80m and 40m are just a matter working them at the right times. Most of hamming is done 11am to 2pm when I'm in my office. Not good for those two bands.
If anyone is just getting an HF receiver and you want to move beyond voice (SSB) or CW (code) then you can hook the audio to your computer and download some of the free digital programs like WSJTX. The most popular mode seems to be FT8. Trouble is all the contacts consists of is callsign, location and signal strength which can get boring. There evidently is still a body of RTTY (teletype) users and they still have social conversations if you want to monitor them.