Does anyone has tips for improving in Frysk! I really like thhis variant but i'm not so good.

One way to improve is to play a lot of games and analyzing them.
Here it is pretty straightforward: most games are lost due to someone getting a king before the other does.
Another way is to do Frisian tactics. As Frysk! works like Frisian, it will help your tactical awareness.

These are just two cents from a beginner Frysk! Player, but I hope I could help.

I will try. Frisian Puzzels are hard for me but they help me learning to understand this game better.