try an equalizer
had an 80's maxon 6 band graphic eq that sounded great as a midrange/volume booster
equalizers get a bit noisy, though
been using a reissue tc electronic classic sustain + parametric eq as a midrange booster/signal compressor and it works really well with my rig ('73 lp custom w/ riff raff/mule into a modded '73 marshall jmp 50w)
got this pedal in a sell/trade pretty much for free, but I think it costed a little fortune (like US$299 new)
you can find much cheaper parametric or graphic equalizers that will do the job
about overdrives, sometimes I use an 80's brazilian oliver sd-10, which was a roland licensed boss sd-1 clone
it has that compressed aggressive feel of the sd-1 which work better for more hard rockish marshall sounds, in my opinion
I also had the mxr wylde overdrive, ts9dx, maxon od808, keeley maxon od808, analog man maxon od9 and a maxon tbo9
they all sounded good and different from each other, but none sounded different enough to the point that one didn't work for something while the other did well (except the tbo9)
I remember the wylde od sounding a lot like a boss or the oliver, but fatter
the ts9x had the regular ts9 sound, a hair more transparent than an sd-1 but more metallic on the top, but had some extra options
the plus mode sounded good for stoner/doom stuff, as it doesn't cut off the low end
the stock od808 was a bit less colored and compressed than the others
the keeley od808 had a lot of gain and the most aggressive voicing
the analog man od9 sounded a lot like the od808, but a bit smoother and less transparent
the maxon tbo9 has a different overdrive circuit and a real tube clean signal booster, so it's not a tube screamer
it's more like the od820 with a different feel
this one had a fatter sound than all the others, but not the same middy tone and texture that are the appeal of having a screamer
good pedal, probably not worth the value just for having a tube
using a regular overdrive for extra gain and a juansolo baby boobtube as a clean booster in front of the amp worked really really well for me, but I ended removing the juansolo fearing I would eventually physically damage the exposed tube