I don't think there is a pre-defined set of traits that will make you likeable in every situation or social circle. Every community has their own unique culture which comes with its own set of qualities that garner respect and appreciation. In pretty much any society anyway, if you don't adorn at least some or most (even all in extreme cases), you can forget about being liked, you simply will not be accepted. To be liked I think you need to align yourself with the views of your community; as long as you have the traits that are respected or deemed important by that community, you will be liked.
However, individuals themselves within any community have their own set of traits that they respect and value. They might be apart of the same social circle which may share the same general beliefs, but each person may value a slight variant of these beliefs, or value something different entirely. Thus in some ways, this constitutes another "level" of likability: having to appeal to the individuals' beliefs. Thus, it's probably obvious that the more traits that you have that are aligned with the ones valued by an individual and/or community, the more you'll be liked.
I think if you demonstrate every trait that all individuals of a community value, and then the traits that the community as a whole values, then you'll be liked. Keep in mind this is just for one community. Going back to my first point, there's a diverse range of societies. To fit perfectly into one and be liked is hard enough, let alone fit into every single one. For example, my family might value the idea of working for what you want, while my friends might think getting people to do things for you/getting things for free with little effort of your own is important. If you are a hard worker then you'll be well liked by your family, but not so much by your friends. Same works vice versa if your values are aligned more with your friends than your family. (This is a shoddy example, but I think it gets my point across sufficiently).
Of course, your likability is determined by a multiple of values, not just one. It's also impacted by your appearance, behaviour, career and choices in life. Sadly, it's also determined by things that are out of your control (e.g. race, skin colour, accent, socioeconomic status etc.)
Given what I've mentioned, it's also then up to you as a person to define what being "liked" or being "likeable" means. Is it to be absolutely adored by your community? What community would this be? Family? Friends? School and work? All of them? Is being liked about being appreciated by only the individuals you respect, or everyone you come across in your life? If its the latter, you're pretty unrealistic.