With headphones there are a number of personal preference questions that need to be asked upfront before a firm recommendation can be made:
1. Open or closed back (or, alternatively, listening environment). Open back typically produce a more “audiophile” sound signature, but have the drawback of allowing sound leakage both in and out. If you plan to listen in a quiet environment without others nearby to be bothered, they are likely preferable, but of course that may not be your reality.
2. Budget. No sense our recommending headphones that you can’t stomach the price of. I guess we can assume you are up for a $500ish set since you got the DT1770 but we don’t know how much further up you can go.
3. Musical genres and/or sonic presentation goals. What kinds of music do you enjoy? Do you care about soundstage and imaging of orchestral music, or want instruments in dense metal tracks to sound clean and distinct, or perhaps you want jazz vocals to sound intimate and sweet? We might suggest different headphones for different preferences.
As you have likely found out already, comfort is highly subjective but is also a major factor. Unfortunately what one person finds supremely comfortable another person finds unbearable, so free returns or being able to try out headphones for an extended time at a shop or otherwise can be very important in ensuring you don’t wind up with fantastic sounding cans that you never use because they hurt your head.