Red to yellow
You can always use clear quartz to up your energy levels and it is such a good all purpose crystal that it's hard to go wrong with it. You can place it on any chakra.
In addition, I'd suggest any of the stones that are red, orange, brown, or yellow. I think you'd do best with fairly intense shades. So you have a choice of the following:
garnet (really good)
ruby
rhodochrosite
brown agates
carnelian
tiger's eye
red tourmaline
yellow topaz
amber
yellow zirrcon
sunstone
geodes
citrine (really good)
smokey quartz
yellow beryl
red jasper
sard
Except for the citrine, put these stones no higher than your solar plexus, if you want to use them on your chakras.
Also, don't overlook the potential of stones you find yourself. These can be among the most useful you'll own. Look for clear, white or any of the colors listed above.
Iron and gold are also helpful for imparting strength and energy. So drag out your gold jewelry and cook with your iron pans if you have any. If you don't, this might be a good time to get one. Also consider burning white, red, orange and yellow candles in a wrought-iron holder.
Hope this helps All the best
