By far in the back, Do you mean it’s not loud enough or the position is perceived to change?
The other post replies are addressing loudness and frequency which are big factors in a mix however if a snare is dry and up front , adding more music tracks won’t push it to the back in terms of spatial positioning , but a lack of tactical panning and tactical depth positioning of all instruments of your mix might result in it being to crowded and the snare is lost.
It helps to have some dry mono tracks ( guitars, bass and mono synths ) dead center or slightly off center to reduce stereo clutter, balance stereo tracks, this adds an amazing amount of field to work with. I like to put the snare around r 10 to r25 and it will sit well, cut right through my mono bass guitars and synths, everything else is in stereo.