If you want brightness then go with the Strion Kit that FiveMega had available.
The strion kits uses a specially base made by FM that uses Streamlight (I think) Strion bi-pin bulbs. These bulbs are brighter than the standard MA02 in your light now, however the brightness does come at a runtime cost.
You will probably need to post a Buy notice on the Marketplace as I don't think FM is currently making these.
If you search hard enough, you will come up to a review by one of our mods (DM51) that reviews these kits.
That is about the only thing that is going to give you noticeable brightness IMO. You can get a different LED ring, but that ring is made for close up work and one of the many benefits of using an A2.
Also, don't use the A2 sparingly. Use it all the time
The more you use it, the more you will fall in love with it. If you haven't already, search for the A2 review from JS. His review will go as deep as you want in regards to the A2. No other review comes close.