Re: haven't writed in a long time?

[Carborundum]

I'd say:

Krro atxan pamrel ke soli oe
I have not written for much time

Here I'm using the indefinite -o to mark the duration (much time) for which this action (writing) has not been going on. This is a bit of a leap; not all languages allow duration to be specified for non-action in the same way as for actual action. Still, it looks pretty neat and rather plausible to me.

[Tswusayona Tsamsiyu]

mllte oe Carborundumhu.
I think it would be better to use infix <ol> instead of <am> in pamrel si just as Carborundum said. the reason for that is that you emphasize the fact that you havn't been writing for a long time but now you started again. the infix <am> just makes it somewhere in the past (tì'efumì oeyä).

['Oma Tirea]

Another simpler alternative: Oe pamrel ke sarmi.

[Tswusayona Tsamsiyu]

also possible