I agree with Oliver, a limiter is not really designed to be used in this fashion. And often times you can hear the pumping when it engages. A compressor is more useful in this scenario. Adding a little compression can even out the dips and peaks, but ideally you’ll use both a compressor and some manual leveling. Then on the output you put a limiter on to reign in the peaks. As with all compression it will boost noise also, so you need a pretty clean audio track. And too much compression actually reduces intelligibility, so you have to be careful not to overdo it.
By far the best value for Compressors is Klanghelm. The MJUC Jr. is free. And the MJUC doesn’t cost much. I use the Mk3 MJUC with about 6db of compression and around 4db of makeup gain.
I’m sure VocalRider is a good option, it was overly pricey at $249. But now it seems to be $89. So I might actually look into it.
And for monitoring levels the Youlean Meters are great and free for the basic version!