are you training for anything specific? if not then just ride for a few months,

take a look at the book base building for cyclists

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who's smarter than you're? i'm!

If you are enjoying what you are doing keep going.

One of the basic ways in which you can start to add variety into your week is look at 3 general workouts that a lot of endurance athletes complete every week.

1. One "long" session where the pace is comfortable and able to maintained.
2. One "hardish" session where the "efforts" total about an hour and are roughly at the intensity you could maintain if tested over the duration of an hour. Something like 2 x 30 minutes, 3 x 20 minutes, 4 x 15 minutes, 45 to 50 minutes straight or even just do a 1 hour (or 30 to 40km) time trial - they are great workouts.
3. One "hard" session, where the "efforts" are above what you could maintain for an hour. Basically as hard as you can maintain so that each effort is at the same intensity as the previous or a little harder. You don't want to be going too hard on the early repeats and falling apart (although this is not bad sometimes, smash yourself and see how long you can hang tough). So something like 4 to 10 repeats totally around 20 to 30 minutes at most. 5 x 4 minutes, 10 x 3 minutes or something like that. Recoveries between efforts are not really complete, but enough so that you can ramp it up again and punch out another effort - so a minute or two. Sometimes people use a hill and do repeats of a hill.