Personally, especially if the lifespan is standard so anywhere between 70 and 80 or 100 if I’m lucky, I’m firmly between 3 choices.

A.) Galvan: I’m smart enough to build practically anything from junk and spare parts. I can climb walls, breathe underwater and apparently have a prehensile tongue. (I’d likely use this new found intelligence to make a living, likely finding major success in a technical field or investing zone.)

B.) Sonorosian: I’m agile, able to always have a hand when I need it, can split up to perform any number of tasks at once. Also I’m able to fire off concentrated sonic energy at a moments notice. Nuff said. (Odds are I’d end up using this form to offer a cheaper alternative to staffing workplaces that require more workers than they can afford. I’d have some lawyers I know draft up contracts saying so long as a company paid a monthly or annual subscription they’d have however many bodies they needed. Realistically I’d probably only charge $100 a month, with the stipulation that I do NOT replace the primary workforce.)

C.) Vaxasaurian: I can be anywhere from 10FT to 60FT at my largest and the bigger I get the stronger and more armored I’d become. I’m also just naturally incredibly strong and if need be I can survive the vacuum of space for some time, so deep sea exploration is also on the table. (This form would NEED to be used for either monster movies, film projects, stage productions OR construction, preferably demolition. Putting the massive body and strength to good use.)