You can start by learning European fonts. My regular script progressed rapidly from learning European style calligraphy. Before that, I practiced Liu style and Yan style.
By the way, in fact, when practicing calligraphy, in addition to writing more, you also need to develop a good habit of reading more posts, which we call "Yilin". And without a good foundation in regular script, practicing regular script is very difficult and dangerous, and may make you lose interest in calligraphy.
If a beginner wants to learn Xingkai or Xingshu, he should start with regular script (such as Ou style). As for Yan, Liu and Ou styles, the choice should be based on people's preferences. According to your own preferences, you can start from any one;
If you want to write small regular script, it is best to start with Lin "Ling Fei Jing";
If you want to understand and enter the higher level of calligraphy realm, then I think we should learn to write seal script and official script, especially seal script.
Finally, we have to work steadily, the most important thing is persistence!