dynadot.com allows 5 days from day of registration to return domains for credit..if u dont sell, email them with request to return..u DONT get money back, but next time u go to buy...you wont pay as you're credit will be there.
dont buy too many imo...buy 3-4 and see how it works for you
you have the advantage of being a native speaker, just make sure you dont make mistakes like u did before...and hope u wont harm yourself in 5yrs
GL (i have no affiliation to dynadot , i just buy from them also)