almost anytime I try to make my own coasts it looks rather horrible(to me anyways) and/or not overly unique, i will admit i should probably work around more to remove Italy Florida and Alaska(or smudge the coastline to be less noticeable) I don't think removing or altering the arctic archipelago would make the map better mainly because it was how it started with the map and it just looks unique but is also to msot people not actually recognizable by sight.

As for the mountains and other such feature's while i am aware that using tectonic plates would solve the issues, the problem is that i have no idea where the tectonic plates would be to help create a majority of the islands and the interior lakes(i hope that made sense i sat here for a minute trying to word it correctly)

but thanks Ligon i hope others have some suggestions as well its always good to have some insight from others.