You can also do like myself and plant yourself some 1* titans for harvesting. Any account that had reached experience level 4 (meaning, 1 hour of play) can create an alliance using the starting 100 gems. With that alliance comes a 1* 88 000 titan ASAP. I recommend creating about 10-12 of these so that the alliances you just harvested have the time to recuperate the next 24 hours and drop back to 1* 88k. That way you won’t have any problems with accidentally messing up a starting alliance and killing their 1*, mistakenly thinking that it might be a dead alliance.
As a side note, today I found out that more than one alliance member can be of an A+ rank. This can be helpful to any alliance to get all of their members be always A+ rank on any titan, if they wish so. A lot of effort is required though, and it requires the alliance to have at least 5 slots available at all times. Also a lot of alternate accounts, semi or fully developed is required, based on the * of the titans you are dealing with. How does it happen?
Inflict severe damage on the titan with multiple alt accounts each, never crossing a certain amount of damage with any of them. Edit: Do not attack with your main accounts yet! That kind of damage which can be surpassed by 3 attacks with your main account. So if you can inflict, say, an average of 100k with your three purple flags on an 8*, you can use each and every one of your alts to inflict up to 80-90k. Drop the titan’s health to that average amount of damage you can inflict with 3 purple flags of your main accounts (around 100k in the example).
After all of this, engage the titan with your main accounts at the same time. Coordinate your last attack to be simultaneous, each of the players with their main accounts killing the titan. That way each of your main accounts would have dealt 100k on the titan - more than any of your alts - and all of your main accounts will have exactly the same score - because the titan has a fixed amount of health left.
Each of the players who scored top equal damage with their main accout (let’s say it was 101 562 which the titan had left, you all will have that score if you killled it simultaneously with the last attacks) will get an A+ rank on that same titan.
I know it’s a lot of work, and probably no one out there will be open to the idea of trying that, but still something to ponder on.