W update, if it's possible, could you make a way or an option in the game to grind the titles faster, or there is a correct way to raise them fast?
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Titles sort of come in three varieties: easy, medium, and 'not supposed to be finished yet'.
The stat grinding ones (basic strength, endurance, etc), and the resistance titles are basically just a matter of planned deaths. Making sure that each death earns a variety of titles is key to faster progression. Using dungeon rewards to level up titles is really only recommended for Programmer or highest-amount type titles (cat person, party planner, level destroyer... anything that counts amounts based on progress in a single life instead of cumulative over all lives).
Then there are the longterm titles. Party planner requires a party level over 250, which is intended to be earned with future party members. Cat Person is intended to be earned once higher level enemies are added. Fast Fingers requires a ton of critical hits (there are equipment items in the Succubus Dungeon's extra rewards intended to help with that).
If you'd like a more comprehensive guide, there are some posts in the tips section of the discord channel with all of the title requirements and some discussions on how to earn some of the more difficult titles.