Redoing Attributes at 20

I know with a certain amount of xp (250 I think I read somewhere) you get more attribute refund points. What happens after 20? I'm almost level 20 now and thinking of redoing some attributes, but Im concerned if I don't like it I wont be able to undo it or try something new since at 20 you stop getting xp. Just wondered if you were still able to play with you attribute points after 20.

Thanks in advance.

As far as I know you only stop leveling at 20, you don't stop getting XP.
Yes, you get a refund point for every 250XP. You can have a maximum of 24 refund points at any time.

That's what Im hoping, because as an elementalist I still havent decided which route I want to take. I just started ascension trials last night (ugh) and Im still missing to many skills from places I havent been to.

There's a lot of air skills I get in that snowy region, I guess somehow I get to those places (like Drokner's Forge and the Mines) AFTER ascension?? Anyway, I'd like to be able to play with my skills and see what I like best when I get tham.

Thanks again.

Correct, you continue to get experience after reaching level 20, so you will constantly have refund points coming in as long as you're killing monsters around your level or doing missions/quests.

And yes, you'll get to Droknar's and Mines after ascention.