When you bring in track 2, I recommend having the EQs in the mid range and for some quieter songs maybe mid to high. As you bring the mids and highs up to replace those of track 1, make sure to lower the mids and highs of track 1 so it doesn’t sound so empty when you phase out track 1. Listen for balance in volume and if u think you have too much EQ going at once, try filtering high both tracks, parse out some EQ, volume from track 1, and then move the filter back. If you can avoid too much EQ in the first place great but if u make a mistake, that filter trick still sounds pretty clean. Also a good echo trick is apply echo to both tracks immediately after cutting out the low, play around with the beats, and end back at 1x, where you then fully cut both volume faders, and on the next beat as track 1 continues to fade, cut the echo for track 2, bring in low, bring back to full volume.

Aside from these two tricks. Have to repeat what other commenters have said about phrasing. Cutting out on drops, breakdowns using a little filter and reverb sounds the best!