Lotus is another 3 bombsite map like Haven. This gives more opportunities for the attackers to plant the spike.
Some times the best way to hold A site is to aggressively use utility at the start of the round to take map control. You can only do this if you have agents like Raze, Breach, Fade, Astra, etc.
Killjoy, Cypher and Chamber are the best sentinels for this map. They are best for holding C site and B if necessary.
The best initiators on Lotus are Fade, Skye, Gekko and Breach. Usually having 2 initiators is better than 2 duelists.
Lotus is a heavy flash map. It's hard to take space without flashes, so prioritize agents like Omen, Breach, Skye, Gekko and Yoru.
Lotus has giant unbreakable doors you can use to enter sites. When you open the door, it will make a very loud sound and everyone can see the door opening on the minimap.