Nice to meet you Stella 
Yep totally agree can be tough.
I think a mix of all three honestly with the current
series on Tapas. Some of the other story ideas have more straightforward ones.
I decide title early in development, once I have a rough idea of what the plot would be.
No haven't changed any title yet, also to avoid the URL getting messed up as a result, and not confusing old readers
I have a bad habit of making some long titles tho 🤣TBH, sometimes I'm tempted to swap to one word titles.
For I'm no̶t̶ a Sick Boy! - The strike through on the 'not' was both for stylistic purpose & double meaning, 'I'm not a sick boy' and I'm a sick boy' ('not' having strikethrough). Wanted to make it personal too so the 'I'm', and imagined 'sick boy' reflecting the MCs are unwilling super-spreaders of an outbreak the gimmick of story but 'sick boy' can also be the MCs owning the derogatory term the authorities dub them "sick boys". Left it open to interpretation. Personality of the title matters too, so went for something that has an edgy implied zombie-horror vibe like 28 days later, night of the living dead, I am legend etc
A BL-thriller short series, hoping to release this year (a stand alone prequel to SickBoy) is named Holiday in Heavensea. This title reflects the plot where a vlogger is hired by his Celeb Crush to film his one week visit to Heavensea (fictional country in both series). Went for a title that feels 'bright and Holiday-ish' and 'too good to be true'. Also thought it has a hook with the two Hs, abbreviated to HiH.
Love to draw but never enjoy doing logos XD so all my titles are simple fonts. Films and games are the standard I try to emulate and thankfully many films have Simple font logos so it didn't bother me too much.
Hopefully someone finds tips in there lol
And wishing you goodluck on your novel 