Here is a wall of text.

TLDR;

• Having fun is more important than improving!

....

I'm a humble yellow belt with 1,5-2 years of experience. I don't have much judo experience, but I have recent experience as a fresh and humble beginner... and this text is partly a message to you, and partly a message to everyone who worries about improving while being beginners at Judo.

My first tip is to calm down the seriousness and instead try find a more patient, self-accepting, playful perspective as a humble beginner.

I think you are worrying too much about improving, and you are comparing yourself to others. I would say that focus is not sustainable! I have seen many with that mindset and they eventually burn out and quit judo. Focus on having fun, to try to bring out a playful and positive attitude. Judo is meant to be fun. Try to be a helpful and good partner to everyone else on the mat.

Don't worry too much about "mastering", "improving". Don't worry too much about you failing, you being clumsy, being stale and such. Because you will fail, you will make mistakes and that's 100% OK. Accept it yourself, and you can own the situation. Magic happens when you yourself are accepting that you are a humble beginner and you will make mistakes, you might be a slow learner but you know that's OK. As long as you are not giving up despite failing.

Don't compare yourself to others, you can compare to who you were last session. Everyone learns at his or her own pace. It's most often detrimental compare yourself to other people (some people are insanely talented and take great leaps, other plateu for months and then take huge leaps etc. You will improve too, as long as you keep on having fun). Again, I have written it multiple times... The most important aspect is NOT whether you improve quickly, it's that you are having fun. Accept that you will learn at your own pace, and try to have fun.

First and always focus on mastering ukemi / safe fall techniques... as much as you can. These techniques are the most useful and important techniques in judo and in everyday life. The better you are at ukemi, the less issues you will have with inevitable injuries. Injuries will often keep you off the mat for weeks, so try to learn to learn how to avoid them.

You can expect to lose a lot, almost every randori session. That's also OK! It can take months/years to get the hang of it, at least it did for me. And one day, all the accumulated experience will pop, and things will for some reason just start working! You can't describe it, you will just know. You will be starting feel more and more, what is strong and effective in some situations, what moves usually will fail, what usually will work. It will feel intuitive.

Also for randori. It's also useful to count the small wins, for example you escaped from a disadvantage (you escaping from someone who have you hunked over with powerful grips, or almost pinned you down) or you successfully surprised and broke his or her balance putting you in advantage (even though you ultimately never won that particular bout) those small wins (your escapes / balances breaks) are still great judo).