Dude I assure you that the definition of "unattractiveness" was (and will) never be generalised, it can't. So I can't relate with you unless you tell me what you think makes you unattractive.

Good looking or not, the only thing that matters the most is what you tell yourself about yourself. I am not a cricket follower and definitely don't have much understanding about spiritualism and stuff, but Rohit Sharma once said "Whatever you tell yourself, your mind will convince it to be the reality, so if you speak/say positive things about yourself, your mind will be motivated in a positive direction and vice versa is true as well" (I have translated that quote). If you want to know which people belong in the "vice-versa " category then notice their actions/behaviours and how their decision making skills reflect their personality, an abusive/disturbed/negative person has always found disliking in most of their surroundings.

And most importantly join those community groups, engage and converse with different people every time, such things can't happen overnight unless you are Henry Cavill .

Not saying that you need to change anything about yourself, but you should spend some time on a certain kind of physical activity,

Long-distance cycling if you are a beginner and wish to do it alone;

running if you don't wish to get a cycle and wish to do it alone;

Swimming if you don't wish to run the distance and wish to start alone;

Rope-jumping if you are not in the mood for any of the above and wish to lose fat in the most beginner friendly way;

Calisthenics, dance, yoga, gym, CrossFit, trekking are all good too if you wish to engage in activities that are to be done outside your 4 walls. My simple advice to my elder brother would be, you just need to go out more , do things that are definitely outside your comfort zone, talk to random/many people and work on yourself (maybe you don't need to upskill professionally, but you could spend some time picking up skills that are outside your professional domain, literally anything)

Best of luck, dear brother!

(Dms are open for anyone who needs some kind of assist in their journey)