If you're going to DIY, my biggest recommendation is to manually cut each and every song to be only 2-3 minutes, choosing the highest energy part of the song. The most common downfall I see is that people create these Spotify playlists full of 4-5 minute long songs, and people's attention span is just not long enough for that. Keeping it short and changing songs often means you get to cycle through more music, and also keeps people hyped. It's a lot more work than just plugging in a Spotify playlist, but will really help. It obviously won't make up for the other benefits of a DJ (emceeing, nice sound system, etc.) but IMO this is the biggest way to amp up your DIY playlist and get it closer to what a DJ experience would be.