I don't recommend mixing angelfish and mollies together due to them having completely different water chemistry requirements. Angels naturally occur in soft acid water vs mollies coming from hard alkaline water that sometimes has salt in it. Domestic angelfish are more tolerant of hard water but not particularly fond of extremely alkaline water or salt. They do adapt but it is preferable to keep fish in water that is similar to what they evolved in.
If you can get the pH around 7.4 and keep the general hardness (GH) around 250-300ppm, you might be ok. However, if the water is too soft (less than 250ppm) the mollies will have problems, if the water is too hard or too alkaline, (pH above 8.0) the angels could have problems. The angelfish will tolerate hard water better than the mollies tolerate soft water, so if you do mix them, try to go for harder water.
How hard is your water supply and what is the pH of it?
And don't add any new fish until the ammonia and nitrite have been on 0 for a few weeks, and until everything has been good for at least 2 weeks. You lost a gourami today and they could cause problems during the next few weeks. Patience grasshopper, the fish will come when the tank is ready