I think that theres no good way to explain it without sounding childisb or egostistical, but ill try nevertheless
conlanging, in its most basic meaning, is "creating languages", but I think that oversells itself.
very little if any conlangs will ever have the expresional power of any natural language, since conlangs have no IRL history to go back on (though, one may simulate that)
People make a vast amount of different conlangs for different reasons:
some want their conlangs to be (ideally) spoken by the whole wolrd, IALS. think of esperanto for the best example
some make their conlangs so that they can make a fictional world feel more real, Art langs. any elvish language by tolkien is a good example
some make conlangs to explore theoretical ways of thinking, or to explore a type of philosophy, Loglangs and philosofical-langs, think of lojban for this.
and some just make conlangs for no particular reason, just for themselfs, Personal langs.
I mainly make personal conlangs, usually trying to be as naturalistic as I can make it.
because of this, I have picked up quite the bit of linguistics in order to have more convincing reasoning for what I do.
I am a fan of diacronics when conlanging (i.e, having historical changes like soundchange and semantic-shifts), including it at either the first stage, or later on.
I have been conlanging for at least 2-ish years, at least to my knowledge. I forgot how I discovered conlanging or why it was so enfatuating to me, but it was. this is the longest hobby I have ever had, and I dont see it stopping any time soon.
unfortunately, very little in actual conlangs. if you count the shortly abandonded works, I probably have over 60 spreadsheets and 3 notebooks worth of ideas I at one point in my life worked on, though, usually for a week at most before finding another thing.
the only (active) conlang that I actually have is cryšk, pronounced [aˈɾiʃka] with IPA. I you cant read IPA, an american english aproximation is "a-dEEsh-kah", or "a-rEEsh-kah" if you want a more english rhodic.
What I lack in actual conlangs I make uo for in conversation, if someone were to ask me how a certain feature developed, I will usually have a few answers, some which actually are attested, and some that aren't but still make sense.
I always love thinking of how things hypothetical could arise, or how a certain system could interact with some other part of the language. thats usually where most of my time goes, just randomly posting snippets of (diacronica) conlang ideas, usually sound-changes